Petra-Aqua Frozen Filter Feeder Food 6 x 100g

Petra-Aqua Frozen Filter Feeder Food is a micronised frozen blend for suspension-feeding marine animals. The product label specifically names sea squirts and azooxanthellate soft and hard corals. Each retail unit contains six 100 g blisters, giving 600 g in total. It is not six cubes inside one 100 g pack.

The label lists flours, nutritional yeast, spirulina, Dunaliella salina, Haematococcus pluvialis, mussel and shrimp autolysates, and salmon oil. It does not list zooplankton, so this page does not use the old "microalgae and zooplankton cubes" description. It also does not extend the product to freshwater fish, fry or nano fish without manufacturer evidence.

What you receive

One basket unit is the supplier's 6 x 100 g grade: six frozen 100 g blisters, 600 g total. The photographed front label belongs to a 100 g blister, while the supplier row defines the six-pack retail quantity. Ordering quantity two therefore means two six-packs, or twelve 100 g blisters in total.

One retail unit	Six 100 g blisters
Total net weight	600 g
Not implied	Six small cubes within one 100 g blister
Product state	Frozen; store at -18 C
Current image	Readable 100 g front label; not a photograph of all six packs together

Check the quantity shown in the basket before checkout. The live price applies to the complete six-pack, and the buy box controls current stock and price. Pack artwork, batch placement and minor label layout can change, but the product identity and 6 x 100 g supply contract should match the order.

What this food is intended for

The front label describes a balanced food composition for filter feeders such as sea squirts and azooxanthellate soft and hard corals. Azooxanthellate means the coral does not rely on symbiotic photosynthetic algae in the same way as many familiar reef corals. These animals depend heavily on suitable captured food, but their feeding structures and particle preferences still differ.

"Filter feeder" is a feeding strategy, not a promise that every suspension-feeding animal can use the same product in the same quantity. Before buying, identify the animal, confirm that it accepts a fine frozen blend, and check the keeper or manufacturer guidance for that species. The label supports the named marine groups; it does not create universal suitability for every coral, sponge, worm, clam or fish.

Full composition visible on the front label

The photographed label gives the following composition: various flours and nutritional yeast; spirulina; Dunaliella salina; Haematococcus pluvialis; and a micronised blend enriched with mussel and shrimp autolysates and salmon oil. It refers the reader to the reverse for additives. The reverse label is not present in the current gallery, so no additive list is invented here.

Label component	What the label establishes	What it does not establish
Various flours	Flours are part of the blend	Source, percentage or allergen declaration
Nutritional yeast	Yeast is listed	Strain, percentage or vitamin analysis
Spirulina	A cyanobacteria-based ingredient is present	Its proportion or a health outcome
Dunaliella salina	A named microalga is present	Cell count or inclusion percentage
Haematococcus pluvialis	A named microalga is present	Astaxanthin concentration
Mussel and shrimp autolysates	Marine animal-derived ingredients are present	Species, ratio or protein percentage
Salmon oil	Fish oil is present	Fatty-acid profile or percentage
Additives	The label says to see the reverse	The unseen additive names or amounts

Microalgae are present; zooplankton is not declared

Spirulina, Dunaliella salina and Haematococcus pluvialis support a natural description of the blend as containing microalgae-derived ingredients. The old product name also claimed zooplankton cubes, but no zooplankton appears in the visible composition. Mussel and shrimp autolysates are animal-derived ingredients, not evidence that whole zooplankton is present.

This distinction matters for shoppers comparing frozen coral food within the wider frozen fish food category. Microplankton, rotifers, Artemia and blended filter-feeder food are separate product types. A nearby word such as plankton should never be used to merge them into one identity. For a product explicitly sold as microplankton, compare the Petra Microplankton Frozen Blister on its own label and intended use.

What "micronised" tells you

The front label says the food is micronised. In practical terms, this means the blend has been reduced to fine material rather than supplied as large whole prey. That format is relevant to animals that capture suspended particles. The label does not state a particle-size range in microns, however, so it cannot prove that every particle fits every coral's capture mechanism.

Particle capture depends on the animal, polyp extension, current, placement, competing filtration and the way the portion is introduced. Watch whether the intended animal actually receives the food. Clouding the whole aquarium is not proof of successful feeding, and a food disappearing into mechanical filtration is not the same as capture.

Moisture and missing analysis

The photographed label states 92% moisture. That is useful for identifying this as a water-rich frozen blend, but it is not a complete nutritional analysis. The current evidence does not provide crude protein, crude fat, fibre, ash, phosphorus or energy values. This page therefore does not invent them or compare the food nutritionally with a pellet or another frozen line.

"Balanced composition" is manufacturer label wording for the intended filter-feeder use. It should not be read as a universal complete-diet claim for every animal. A specialist coral or sea squirt may require more than one food type, and the correct feeding plan depends on the exact animal and aquarium.

Checks before the first feed

• Identify the animal and confirm that fine suspended frozen food is appropriate.
• Read the complete pack, including the reverse, because additives and any batch-specific instructions may be there.
• Check the best-before and batch markings are present and readable.
• Confirm the blister is sealed and has remained frozen as expected.
• Review nitrate, phosphate and filtration performance before adding another nutrient source.
• Choose a clean feeding tool and a method that suits the aquarium's flow design.
• Plan a small first amount rather than assuming one whole blister is a single feed.

Portion by aquarium response, not pack count

A 100 g blister is a storage unit, not a universal single serving. Aquariums differ enormously in water volume, animal biomass, capture efficiency and nutrient export. The evidence available for this listing does not give one safe spoon, cube or millilitre amount. Begin with a small system-appropriate portion and adjust only after observing capture and subsequent water quality.

Use a clean tool so the remaining frozen food is not contaminated. Remove only what you intend to prepare, keep the rest at -18 C, and follow the complete pack instructions for preparation. Do not use hot water, household food utensils that will return to human use, or an unmeasured whole blister simply because it is convenient.

Target or broadcast feeding

Target feeding can place a fine suspension nearer a particular coral or sea squirt. Broadcast feeding distributes it more widely through the system. Neither method is automatically better: target feeding can still miss the animal, and broadcast feeding can send much of the food into filters or low-flow deposits.

If your established method involves dispersing a small amount in aquarium water, use a clean container and water from the aquarium rather than untreated tap water. Introduce the portion gently where the intended animal can encounter it. Avoid blasting tissue with a concentrated jet. Observe extension, capture and release rather than assuming contact means ingestion.

Flow, filtration and skimming

Filter feeders need moving water to bring particles within reach, while aquarium equipment can remove the same particles before capture. This creates a system-specific balance. The current label does not tell keepers to stop return pumps, circulation pumps, skimmers or mechanical filters for a fixed time.

Follow the aquarium's established feeding plan. If any equipment is adjusted, use a timer and restore normal operation promptly. Never leave oxygenation, circulation or filtration off because a generic page supplied an arbitrary number of minutes. Systems with animals that depend on high oxygen or continuous flow need especially careful planning.

How often to offer it

There is no defensible universal schedule in the available product evidence. Frequency depends on the animal's biology, other foods, recent feeding response, nutrient readings and export capacity. A non-photosynthetic coral may require deliberate regular feeding, but that does not make one fixed schedule correct for every species or aquarium.

Record the date, amount, method, animal response and later nitrate/phosphate readings. Change one variable at a time. If tissue condition, polyp extension or water quality worsens, review the entire husbandry plan rather than automatically increasing food.

Nutrient control and water quality

Any uneaten frozen food adds organic material. Excess can contribute to bacterial films, detritus, oxygen demand, nitrate and phosphate. A strong filter does not make overfeeding harmless. The goal is efficient capture with the smallest effective input, followed by normal export and maintenance.

Observation	Possible meaning	Practical review
Food is removed immediately by floss	Delivery path may be inefficient	Review placement, flow and equipment timing
Persistent clouding	Portion may exceed capture/export	Reduce the next amount and inspect deposits
Rising nitrate or phosphate	Total nutrient input exceeds export	Review all foods, stock and maintenance
No visible capture	Animal, particle or timing mismatch	Confirm species needs before adding more
Stable readings and consistent capture	Current method may be proportionate	Keep records and avoid unnecessary increases

Label-supported animals

The label gives two useful examples: sea squirts and azooxanthellate soft and hard corals. It does not name a particular genus or species. Confirm the requirements of the animal in your care, because some sea squirts and non-photosynthetic corals have specialised particle, flow and feeding-frequency needs that a general product label cannot resolve.

Other filter feeders may accept fine food, but acceptance must come from that animal's care evidence rather than from the broad phrase "filter feeder". This page does not promise suitability for sponges, feather-duster worms, clams, anemones, photosynthetic corals or fish unless their own guidance supports the blend.

Why this is not listed as a freshwater or fry food

Neither the Petra supplier row nor the photographed label supports those uses. The label's examples are marine filter feeders and non-photosynthetic corals. There are dedicated frozen feeds for small fish and freshwater species, and those should be selected by their own labels.

For a broad frozen prey product, compare the Frozen Artemia 6 x 100 g. For a different fine marine product, compare Petra Red Rotifer Frozen Blister. These links are comparisons, not claims that the foods are interchangeable.

Frozen storage at -18 C

The product label states storage at -18 C. Make freezer space before ordering and transfer the packs to suitable frozen storage immediately after receipt. Keep them away from household food, protect the seals from damage and avoid repeated temperature changes.

Do not rely on appearance alone to judge cold-chain history. If the packs are not frozen as expected, a seal is open, liquid has leaked, or batch/best-before information is missing, photograph the parcel and product and contact Tropical Fish Co before use. This page does not declare partly thawed food universally safe to refreeze.

Planning a frozen-food delivery

Frozen goods need more preparation than dry fish food. Check the current delivery information, postcode availability, dispatch schedule and checkout service before ordering. Make sure someone can receive the parcel and that freezer space is ready. Do not place an order on the assumption that every postcode or delivery day uses the same service.

On arrival, inspect the outer parcel, the six blisters, seals, label, batch and condition before putting the product away. If there is a problem, retain the packaging and provide clear photographs promptly. The current returns and problem-reporting policy controls evidence and eligibility.

How to read the current gallery image

The sole gallery image is useful because it shows the real Petra-Aqua front label at readable resolution. It displays the Filter Feeder Food name, target groups, composition, moisture, 100 g net weight, barcode and -18 C storage line. It does not show the reverse, the full additive declaration, all six packs together or the exact batch that will be dispatched.

The image remains in its existing position. Its role is label evidence, not decoration. Packaging can be updated by the manufacturer, so compare the delivered label with this page and follow the current physical pack when details differ.

How it differs from nearby frozen foods

Product	Identity	Choose it when
Filter Feeder Food	Micronised blend labelled for sea squirts and azooxanthellate corals	The intended animal's care supports this fine blend
Microplankton	Separate Petra frozen product	You need the product named Microplankton and its label fits the animal
Red Rotifer	Separate rotifer product	You need a rotifer-based frozen food
Sextet Marin	Separate mixed marine frozen-food product	You want the variety stated on that pack
Mussel Meat	Larger animal-tissue food	The animal requires a meat food of that format
Artemia	Whole brine-shrimp frozen food	The target fish or invertebrate accepts Artemia

Do not choose by search volume or a similar photograph. Choose by product identity, particle format, ingredient list and the animal's feeding biology. The frozen blister food category lets you compare the available packs without pretending they share one use.

Animal ingredients and handling

The label includes mussel, shrimp and salmon-derived ingredients. This matters for keepers who avoid particular inputs or have handling allergies. The current front label does not provide a complete allergen or cross-contamination statement. Handle cautiously, use dedicated tools and consult the complete physical packaging if this information affects your household.

Never taste aquarium food. Clean spills promptly and disinfect preparation surfaces used for aquarium equipment. Do not pour unused prepared food into household sinks where it can create odour or hygiene problems; contain and dispose of it appropriately.

Common mistakes to avoid

• Calling the six-pack six cubes rather than six 100 g blisters.
• Repeating the old zooplankton claim when the visible label does not list it.
• Assuming every filter feeder accepts the same particle size.
• Feeding one whole blister as a universal serving.
• Turning all flow and filtration off for an arbitrary period.
• Using the product as a complete diet without species evidence.
• Extending the label to freshwater fish, fry or nano fish.
• Ignoring nitrate and phosphate because the food is "natural" or frozen.
• Refreezing a questionable delivery without contacting support.
• Using aquarium-food tools again for human food.

Pre-purchase checklist

• Your animal is a sea squirt, azooxanthellate coral or another species with evidence for this blend.
• You understand the order is six 100 g blisters, 600 g total.
• You have freezer space that maintains -18 C.
• You can receive and inspect the frozen parcel promptly.
• You have a clean portioning and feeding method.
• You can monitor capture, nitrate and phosphate.
• You will read the reverse label before first use.
• You accept that the current gallery shows one 100 g front label, not all six packs.

Ordering from Tropical Fish Co

The buy box shows the current live price and stock for one six-pack. The established product route is retained for continuity, while the title now identifies Petra-Aqua, the filter-feeder use and the exact 6 x 100 g quantity without a supplier code or unsupported ingredient claim.

Frozen-delivery eligibility, dispatch timing and any evidence deadline are controlled by the current checkout and policy pages. Check those details before payment, especially for remote or restricted postcodes. Product availability does not by itself guarantee that every delivery service can carry frozen food to every address.

Evidence and information limits

Pack quantity and category come from Petra's current supplier row. Product identity, target groups, composition, moisture, net weight, storage temperature and human-consumption warning come directly from the preserved high-resolution front label. The current image does not show the reverse label, so additive details and any reverse-side feeding directions remain outside this page.

The page deliberately removes unsupported claims rather than replacing them with new guesses. If Petra supplies an updated technical sheet or a complete rear-label photograph, ingredient, analysis and feeding details can be expanded after reconciliation. Until then, the delivered packaging is the final instruction source.

Frequently asked questions

How much food is included?

One retail unit contains six 100 g frozen blisters, 600 g total. Quantity two gives twelve 100 g blisters.

Are there six cubes in one blister?

No. The supplier grade is 6 x 100 g: six 100 g blisters. The 100 g front label in the gallery belongs to one blister.

Which animals does the label name?

The label names filter feeders such as sea squirts and azooxanthellate soft and hard corals. Confirm the exact animal's needs before feeding.

Does it contain zooplankton?

Zooplankton is not listed on the visible label. The old zooplankton-cube wording has therefore been removed.

Which microalgae ingredients are listed?

The label lists spirulina, Dunaliella salina and Haematococcus pluvialis. It does not give their percentages.

Does it contain animal-derived ingredients?

Yes. Mussel and shrimp autolysates and salmon oil are listed. The front label does not provide their proportions.

Is this a complete coral diet?

The label calls it a balanced composition for the named filter feeders, but the evidence does not support a universal complete-diet claim. Plan feeding for the exact animal.

Can I feed it to freshwater fish or fry?

That use is not supported by the supplier row or visible label. Choose a product whose own instructions name freshwater fish or fry.

How much should I feed?

No universal amount is supplied in the available evidence. Start with a small system-appropriate portion, observe capture and monitor nutrients.

How often should I feed it?

Frequency depends on the animal, other foods and aquarium nutrient control. Follow the complete pack and species guidance rather than a generic fixed schedule.

Should I switch off pumps and the skimmer?

The front label gives no fixed equipment timing. Follow the aquarium's established feeding plan, use a timer for any adjustment and restore normal operation promptly.

How should it be stored?

Store at -18 C as stated on the label. Keep the packs sealed, separate from household food and protected from temperature changes.

What should I do if it arrives soft or damaged?

Photograph the parcel, packs, seals and labels and contact Tropical Fish Co before use. Do not assume questionable food is safe to refreeze.

Is it safe for people to eat?

No. The label states not for human consumption. Use dedicated aquarium-food tools and wash hands after handling.

Does the gallery show all six packs?

No. The preserved image shows a readable 100 g front label. The retail quantity is established by the supplier's 6 x 100 g row.

Where can I compare other frozen foods?

Use the frozen blister food category and compare each product's own label, format and intended animals.