Moderate
Ring-Necked Shrimp (Macrobrachium assamense)
22–28°C · pH 6.5–7.5 · 40L
£19.99
Striking Blue Mary Shrimp (Neocaridina davidi) for planted freshwater aquariums. Peaceful, hardy blue Neocaridina with rich translucent colouration. Order now with live arrival guarantee.
Adult size is the maximum length this species reaches at full maturity (scientific sources). The livestock you receive will be younger and smaller — pick a size variant above for the actual shipping size. Photos are AI-enhanced, so the animal may show subtle colour or marking differences.
Neocaridina davidi blue mary
Blue Mary Shrimp are a shoaling species — they need 6+ to feel safe and show their full colour. Larger shoals stay calmer, eat better, and look stunning.
Striking Blue Mary Shrimp (Neocaridina davidi) for planted freshwater aquariums. Peaceful, hardy blue Neocaridina with rich translucent colouration. Order now with live arrival guarantee.
Adult size is the maximum length this species reaches at full maturity (scientific sources). The livestock you receive will be younger and smaller — pick a size variant above for the actual shipping size. Photos are AI-enhanced, so the animal may show subtle colour or marking differences.
Add vibrant red colour and natural algae control to your aquarium with Cherry Shrimp. Peaceful, hardy Neocaridina ideal for planted nano tanks. Order today for UK delivery.
Maintain these water conditions for optimal health and vibrant colors
The Blue Mary Shrimp is one of the most eye-catching choices in the freshwater shrimp UK hobby because its colour appears soft, translucent and blue from the body tissue rather than looking like a flat painted shell. This elegant blue form of Neocaridina davidi stays small at around 2.5-3 cm, lives for roughly 1-2 years, and suits aquarists who want peaceful, active scavengers for a nano tank or planted community. If you are looking for aquarium shrimp UK keepers can enjoy without specialist acidic water, Blue Marys are a smart option. They are often chosen by people searching for freshwater aquarium shrimp uk, live aquarium shrimp for sale uk or cherry shrimp for sale uk because they combine unusual colour with the forgiving nature of Neocaridina. Their blue mary shrimp tank requirements are straightforward, their blue mary shrimp ideal conditions are easy to maintain, and they are excellent for a freshwater shrimp aquarium with mosses, wood and leaf litter. For anyone comparing aquarium shrimp for sale uk listings, Blue Mary Shrimp stand out as a colourful, peaceful and rewarding species that grazes algae, breeds readily and brings constant movement to a well-run shrimp tank. For full husbandry detail, see our cherry shrimp care guide, which covers the whole Neocaridina davidi group this blue line belongs to.
Blue Mary Shrimp are a selectively bred colour form of Neocaridina davidi, the same species behind many popular cherry shrimp lines. In the aquarium hobby they sit alongside other hardy Neocaridina varieties rather than specialist Caridina such as crystal bee shrimp. That makes them especially appealing to fishkeepers who want reliable colour, simple care and regular breeding in ordinary, community-friendly freshwater conditions.
Although Blue Mary Shrimp sold in the hobby are captive-bred, their species traces back to East Asia, especially Taiwan and nearby regions where Neocaridina davidi occurs in slow-moving inland waters. In the wild, relatives of these shrimp inhabit ponds, drainage channels, streams, lakes and vegetated margins of rivers. Blue Mary is a domesticated aquarium strain bred for colour, not a wild-collected animal, so it is best kept in a stable indoor aquarium rather than treated like a pond or river species.
Natural habitats are rich in biofilm, decaying leaves, algae films, soft sediments and submerged roots. Shrimp spend most of the day grazing on microscopic food rather than chasing large prey. This explains why a mature tank works better than a sterile one. In a well-aged setup they pick continuously at surfaces, mosses and wood, just as their ancestors would at stream edges.
Because Blue Mary Shrimp are selectively bred, their best colour appears in stable captive conditions. Their natural behaviour still reflects their ancestry: they prefer cover, graze constantly, moult regularly and feel safest in groups. A planted aquarium with moss, leaf litter and gentle flow is the closest practical match to their ancestral habitat.
Mimicking a natural shrimp habitat improves survival and colour. Use wood, moss, leaf litter and a mature biofilm-rich tank rather than an over-clean setup. Shrimp raised in stable, naturalistic environments usually moult more cleanly and show more confident daytime behaviour.
The best blue mary shrimp aquarium setup starts with stability, not expensive gadgets. A 20-litre aquarium is the blue mary shrimp minimum tank size, but 30-45 litres is easier to manage because water changes and feeding mistakes have less impact. For anyone planning a true colony, larger volume is a real advantage. Good blue mary shrimp tank setup planning should focus on mature filtration, lots of surface area and gentle flow.
The official minimum is 20 litres, but realistic blue mary shrimp tank requirements depend on your goals. A small group of 6-10 can live well in 20 litres, while a growing blue mary shrimp colony will benefit from 30 litres or more. If you are wondering how many blue mary shrimp per tank, a lightly stocked 20-litre setup can start with 6-12 adults, then expand naturally as long as filtration and maintenance keep up.
The most reliable blue mary shrimp water parameters are: temperature 18-28°C, pH 6.5-8.0 and hardness 4-15 dGH. In practice, the sweet spot for long-term health is usually 20-24°C, pH around neutral to slightly alkaline, and moderate mineral content. The ideal blue mary shrimp water temperature for breeding and activity is often 21-24°C. If you are searching blue mary shrimp temperature or blue mary shrimp water hardness, remember that consistency matters more than chasing a single number.
For mineral balance, many keepers ask about blue mary shrimp GH KH requirements. A moderate GH helps proper moulting and shell formation, while a small but measurable KH helps buffer pH swings. These are broad freshwater shrimp requirements for Neocaridina in general. Compared with more delicate Caridina, Blue Marys tolerate a wider range, which is one reason they are popular with beginners.
A sponge filter is usually best for shrimp tanks because it offers gentle circulation, huge grazing area and excellent safety for shrimplets. Small hang-on filters can work too, but always cover the intake with a pre-filter sponge. Shrimp dislike sudden current and do better when food and biofilm are not blasted away. If you are building a shrimp-focused setup, browse the wider Freshwater Shrimps collection for ideas on species that suit similar systems.
One of the most common questions is sand for shrimp tank or shrimp gravel - which is better? For Blue Mary Shrimp, both can work. Fine dark gravel gives strong contrast and helps blue colour stand out. Fine sand is also useful because food stays on the surface where shrimp can find it easily. The best sand for shrimp tank is inert, clean and not sharp. A depth of 2-4 cm is enough for rooted plants and easy maintenance.
Plants for shrimp tank setups are more than decoration. Mosses, subwassertang, floating plants, fine-leaved stems and epiphytes create feeding surfaces and shelter for babies. Blue Marys do especially well with plants, and a blue mary shrimp in planted aquarium display often shows better behaviour and breeding. Good choices include Java moss, Christmas moss, Anubias nana, Bucephalandra, Java fern and floating Salvinia. Keepers comparing colour strains may also enjoy Blue Rili Shrimp, Orange Rili Shrimp or Red Rili Shrimp in similarly planted displays, though colour lines should not be mixed if you want stable offspring colour.
Moderate lighting for 6-8 hours daily is ideal. Strong light is fine if plant growth is the goal, but balance it with algae control and cover. Too much light in a bare tank can stress shrimp. In planted setups, lighting supports biofilm and grazing opportunities as well as plant health.
Always cycle a shrimp tank for 4-6 weeks before adding stock. Mature biofilm is one of the biggest differences between a tank where shrimp merely survive and one where they thrive, moult well and breed regularly.
The natural blue mary shrimp diet is omnivorous and based mostly on tiny foods: biofilm, algae, detritus, decaying plant matter and microorganisms. In the aquarium, the best blue mary shrimp feeding guide starts by understanding that shrimp are grazers first and pellet eaters second. A mature tank should provide background food all day, while prepared foods fill nutritional gaps.
Staple foods include quality shrimp pellets, algae wafers, biofilm-support foods and botanicals such as Indian almond leaves. This is the foundation of a good freshwater shrimp uk diet. Blanched spinach, courgette and nettle can be offered in small amounts. Shrimp also consume their moulted shells for minerals, so do not remove fresh moults unless they begin to foul.
Supplemental protein can be offered once or twice weekly using shrimp-specific foods with insect meal, soybean hull, spirulina or tiny crustacean ingredients. Blue Marys do best with dedicated shrimp foods and natural biofilm rather than heavy meaty feeding, so keep protein portions small and occasional.
Blue Mary Shrimp are ornamental aquarium pets, not seafood, so feed only aquarium-grade foods. Avoid oily kitchen scraps, salted vegetables, bread, and anything treated with copper-based medication, which is toxic to invertebrates. Do not rely on generic frozen or marine foods that are meant for very different animals; they offer little benefit and can foul a small shrimp tank.
People often ask how often should you feed freshwater shrimp or how often to feed freshwater shrimp. In a mature tank, feed very lightly 3-5 times per week. In a newer tank with less biofilm, tiny daily portions may be better. The rule is simple: all prepared food should be mostly gone within 2-3 hours. If food remains overnight, reduce the amount.
| Time | Food | Amount |
|---|---|---|
| Morning | Biofilm graze / algae in tank | Natural feeding |
| Evening | Shrimp pellet or blanched veg | Very small portion, removed if uneaten |
A useful companion choice for keepers building a shrimp-focused algae-grazing setup with hardy Neocaridina lines.
Overfeeding is one of the fastest ways to crash a shrimp tank. Excess food rots, ammonia rises, oxygen falls and moulting problems often follow. Feed less than you think, especially in small aquariums.
If you have ever asked what is blue mary, the answer is a selectively bred blue form of cherry shrimp with a softer, more translucent look than heavily opaque blue lines. Adult size is usually 2.5-3 cm, with females larger and fuller-bodied than males. The body shows blue tissue colour through a semi-clear shell, which can range from pale sky blue to deeper steel-blue depending on genetics, diet, age and background.
Searches such as what color is mary blue reflect how people try to define this shade. In aquarium terms, Blue Mary is usually a cool translucent blue, sometimes with a slight smoky undertone. Females are more intensely coloured and may show a visible saddle behind the head when mature. Males are slimmer, often lighter and more transparent.
Compared with standard cherry shrimp for sale strains, Blue Mary offers a calmer, more glassy look. It is different from Blue Dream, which is often more solid and opaque. It is also distinct from Blue Rili, which has clear body sections. If you like comparing colour forms, take a look at Super Red Sakura Shrimp, Orange Sakura Shrimp and Red Sakura Shrimp to see how body opacity and pigment coverage vary across Neocaridina lines.
To improve colour, use dark substrate, stable minerals, moderate feeding and a planted environment. Mature females show the translucent blue effect most clearly, especially against dark moss and wood.
One of the biggest questions for new keepers is what can live with freshwater shrimp. Blue Marys are peaceful, non-territorial and among the best shrimp for community tank setups when tank mates are chosen carefully. The main risk is not aggression from the shrimp, but predation from fish. Even small fish may eat baby shrimp.
The safest blue mary shrimp tank mates are other peaceful invertebrates and tiny, non-predatory fish. Snails are excellent companions, so the common question about shrimp and snails has an easy answer: yes, they usually work very well together. Nerite snails, ramshorns and mystery snails share similar needs and help with cleanup without threatening shrimp.
Among fish, Otocinclus are one of the best options once the tank is mature. Very small rasboras can work in larger planted tanks, though some shrimplet losses should be expected. If you want to compare Neocaridina colour lines in similar setups, Blue Rili Shrimp, Orange Rili Shrimp, Red Rili Shrimp and Super Red Sakura Shrimp all share similar broad care patterns.
Blue Mary Shrimp are not truly blue mary shrimp safe with fish if those fish are large enough to hunt them. Avoid cichlids, puffers, loaches, most barbs, crayfish and larger gouramis. Even “peaceful” fish may snack on shrimplets. This is why shrimp-only or shrimp-first aquariums are best if breeding matters.
In a 30-litre planted shrimp tank, keep 10-15 Blue Mary Shrimp with snails only for best breeding results. In a 60-litre heavily planted community, a group of Blue Marys can coexist with Otocinclus and a small shoal of micro rasboras if you provide moss thickets and leaf litter. That makes them a good answer for aquarists searching how to care for blue mary shrimp, blue mary shrimp care guide or cherry shrimp care uk advice for mixed tanks.
| Species | Compatible? | Notes |
|---|---|---|
| Blue Rili Shrimp | ⚠️ Caution | Similar care, but mixing colour lines can lead to less predictable offspring colour. |
| Snails | ✅ Yes | Excellent companions; useful answer to the common shrimp and snails question. |
| Cichlids / Puffers | ❌ Avoid | High predation risk for adults and shrimplets. |
People comparing blue jelly shrimp water parameters, blue rili shrimp uk and Blue Marys should know that care is broadly similar, but colour genetics differ. If your goal is a strong breeding line, keep one colour morph per tank. For buyers searching buy neocaridina shrimp, neocaridina shrimp for sale uk, buy aquarium shrimp online uk or live freshwater shrimp for sale uk, Blue Mary is often the better choice when you want hardy Neocaridina rather than specialist shrimp.
Always quarantine new arrivals for 2-4 weeks when possible. Shrimp are sensitive to sudden pathogens, medications and water chemistry changes, so a careful introduction protects both the new stock and your established colony.
Blue mary shrimp breeding is one of the main reasons this variety is so popular. They are prolific under stable conditions and are suitable for hobbyists wanting a self-sustaining display. If you are building a blue mary shrimp colony, start with at least 8-10 individuals to improve the odds of getting both sexes.
A dedicated shrimp tank of 20-30 litres with moss, sponge filtration and stable minerals is ideal. Mature females are larger and show a curved underside for carrying eggs. A visible saddle behind the head often indicates developing eggs. Sexing is easy with a little practice: freshwater shrimp uk male individuals are slimmer, smaller and often less intensely coloured than females.
After moulting, a receptive female releases pheromones and males become noticeably active. This is normal and often the first sign breeding is underway. People asking how often do freshwater shrimp breed should expect regular breeding in a healthy colony, especially at warm but not excessive temperatures with steady feeding.
Females carry roughly 20-30 eggs under the abdomen for around 2-3 weeks. She fans them constantly to keep them oxygenated and clean. Unlike many aquatic invertebrates, Neocaridina davidi do not pass through a free-swimming larval stage. Babies hatch as miniature shrimp, which makes them much easier to raise than marine species.
Baby shrimp need biofilm, powdered shrimp food and dense cover. Mosses are especially useful because they trap microorganisms and protect young shrimp from fish. If shrimplets disappear, the usual causes are predation, unstable water or over-cleaning. Unlike some harder-to-breed invertebrates, Blue Marys reproduce readily once a colony is settled, so patience and stable water are usually all that is needed.
To keep the line looking blue, cull selectively for colour depth and avoid mixing Blue Mary with other Neocaridina morphs. Mixed colonies may still be healthy and attractive, but offspring can revert toward wild-type or produce inconsistent shades over time.
Comparing shrimp lines matters because many look similar online but behave differently in breeding projects. Blue Mary is often chosen by aquarists who want a translucent blue shrimp that is hardy, active and easier than Caridina. It is especially attractive for keepers deciding between classic cherry shrimp strains and more specialist bee shrimp.
| Feature | Blue Mary Shrimp | Crystal Bee Shrimp |
|---|---|---|
| Max Size | About 3 cm | About 2.5-3 cm |
| Care Level | Easy to moderate | Advanced |
| Temperature | 18-28°C | 20-24°C preferred |
| Best For | Hardy planted shrimp tanks | Specialist soft-water setups |
| Feature | Blue Mary Shrimp | Blue Rili Shrimp |
|---|---|---|
| Body Style | Translucent blue coverage | Blue with clear sections |
| Breeding Stability | Good within line | Good within line |
| Visual Effect | Soft, smoky blue | High contrast rili pattern |
| Best For | Natural blue colony look | Pattern-focused display |
Choose Blue Mary if you want a calm, elegant blue tone and straightforward Neocaridina care. Choose crystal bee shrimp only if you are prepared for tighter water control. Choose Blue Rili Shrimp if you prefer patterned bodies, or Orange Sakura Shrimp and Red Sakura Shrimp if you want stronger opaque pigment. For many keepers searching best shrimp for community tank, Blue Mary offers one of the best balances of colour, hardiness and breeding ease.
Healthy Blue Mary Shrimp are active grazers with clear movement, regular moults and good appetite. Females should carry eggs confidently when settled, and juveniles should be visible on plants and hardscape. If shrimp hide constantly, stop feeding, fail to moult or die after water changes, the issue is usually environmental rather than infectious.
Moulting trouble is one of the biggest risks. This is often linked to poor mineral balance, sudden TDS shifts or stress. Failed moults may leave shrimp trapped in the old shell. Another frequent issue is unexplained loss after adding medication, especially if copper is present. Bacterial decline can also occur in dirty tanks with excess organics.
The best treatment is prevention: stable water, moderate feeding, regular testing and slow acclimation. Small weekly water changes of 10-20% are safer than large changes. Quarantine all new livestock and plants when possible. Good freshwater shrimp uk health care starts with water quality, because most shrimp losses come from chemistry swings, toxins or predation rather than classic fish diseases.
Never use copper-based medications with shrimp or other invertebrates. Copper can be lethal even at low doses. Always read labels carefully before treating a community tank that contains shrimp or snails.
For long-term success, the condition of the shrimp and the quality of acclimation matter more than chasing the cheapest listing, so always start with healthy, well-conditioned stock.
Blue Mary Shrimp are peaceful, social and constantly busy. They are not schooling animals in the fish sense, but they do feel more secure in groups and are best kept in numbers of 6 or more. Most of the day is spent grazing on surfaces, climbing through moss and picking at microscopic food.
They are usually most visible in mature tanks with lots of cover. In sparse aquariums they can seem shy, especially after transport or moulting. During breeding periods, males may dart around the tank searching for a female that has recently moulted. This burst of activity is normal.
One of the nicest things about keeping Blue Mary Shrimp is how much behaviour you see in a small space. In a well-planted aquarium, adults, juveniles and berried females all use different micro-areas of the tank. This makes them ideal for aquarists who enjoy close observation rather than fast, flashy fish movement.
When people search shrimp for sale UK, shrimps for sale near me, blue mary shrimp for sale UK or where to buy blue mary shrimp UK, they usually want three things: healthy stock, accurate identification and safe delivery. That matters with Blue Mary Shrimp because colour quality, moulting condition and acclimation all affect how well they settle.
Our Blue Mary Shrimp are selected for the soft blue body tone that makes this line popular, with attention paid to active behaviour, clean shell condition and strong feeding response before dispatch. This is especially important for buyers comparing blue mary shrimp online UK, buy blue mary shrimp UK and order blue mary shrimp UK results. We do not treat them like generic mixed cherry shrimp.
Each batch is checked in holding systems for stability and feeding before shipment. Shrimp are packed in insulated boxes, with seasonal heat protection when needed, and sent by tracked delivery. That makes a real difference for anyone concerned about blue mary shrimp delivery UK and transit stress. We also provide practical acclimation guidance because sudden pH or hardness changes are one of the main causes of post-arrival losses.
If you are comparing blue mary shrimp price UK, cheap blue mary shrimp UK, blue mary shrimp shop UK and cherry shrimp for sale uk listings, remember that healthy, well-conditioned shrimp settle faster, moult better and breed sooner. Order your Blue Mary Shrimp today with confidence and build a striking blue Neocaridina colony in a properly prepared aquarium.
Complete your Neocaridina setup with related colour forms and compatible shrimp options. For a stronger opaque red contrast, consider Super Red Sakura Shrimp or Red Sakura Shrimp. If you prefer patterned shrimp, Blue Rili Shrimp, Orange Rili Shrimp and Red Rili Shrimp make excellent alternatives. For a brighter orange colony, try Orange Sakura Shrimp. You can also browse the full freshwater shrimp UK collection to compare colour lines, colony options and other freshwater shrimp for sale uk choices for planted nano aquariums.
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