By Priya Ramesh
The most colourful freshwater fish you can keep - if you build the right tank
If you've seen a Lake Malawi cichlid tank in full colour, you don't forget it. Electric-yellow labs, cobalt-blue mbuna, orange and red peacocks - all glowing against pale rock like a coral reef that somehow ended up in freshwater. It's the look that pulls most people in, and it's the reason "lake malawi cichlids" is a search people make with a tank already half-imagined.
I'm Priya Ramesh, and cichlids are my specialism - I write our angelfish and discus guides too. But Malawi cichlids are a different animal from those soft-water South Americans, and this is the page where I'm going to be straight with you. These are the most spectacular freshwater fish you can buy, and they're a specialist setup, not a community tank you add to. Almost every problem people have with Malawi cichlids comes from treating them like ordinary tropical fish - putting them in soft water, in a small tank, with tetras, and feeding them the wrong food.
This guide is the answer we'd give a customer who walks in and says "I want those bright African cichlids." It covers the three groups you'll choose between - mbuna, peacocks and haps - the hard-water and aggression rules that make or break the tank, and the 12 species we currently have in stock. Get the setup right and they're hardy, long-lived, and unmatched for colour. Get it wrong and it's a stressful, aggressive tank that disappoints everyone.
The electric yellow (Labidochromis yellow Kakusa) - the friendliest mbuna and the classic first Malawi cichlid. That intense yellow comes from the fish's own pigment cells, and it holds its colour better against dark substrate and pale rock. Credit: Tropical Fish Co.
Lake Malawi cichlids need hard, alkaline water (pH 7.8-8.6) and are aggressive and territorial. That makes them incompatible with soft-water community fish - tetras, rasboras, most barbs, gouramis. Don't plan a "Malawi cichlids plus a few tetras" tank. It's a dedicated single-biotope setup, full stop.
Fun facts - the stuff most UK guides skip
- Lake Malawi holds more fish species than any other lake on Earth - and most are cichlids. The lake's cichlids are a textbook "adaptive radiation": a single ancestral lineage exploded into hundreds of species, many found nowhere else. A 2018 genomic study sequenced the whole flock and found the radiation happened in multiple bursts, still interconnected by gene flow between groups [2]. That's why so many look subtly related - they are.
- "Mbuna" literally means "rockfish" in the Tonga language of the lakeshore. It's not a scientific group but a hobby term for the rock-dwelling species - Pseudotropheus, Labidochromis, Melanochromis and friends - that graze algae off the lake's boulders [4]. Knowing the word tells you the habitat: rock, rock and more rock.
- Almost all Malawi cichlids are mouthbrooders. After spawning, the female scoops the fertilised eggs into her mouth and broods them there for around three weeks, not eating, until the fry are free-swimming [1]. You'll spot a "holding" female by her bulging throat and the way she stops feeding - it's one of the most extraordinary behaviours in the freshwater hobby.
- The electric yellow's wild form is mostly blue, not yellow. The blazing-yellow Labidochromis caeruleus that fills shops is a selectively-favoured morph; in parts of the lake the same species is a pale blue-and-white fish [3]. The yellow we know is essentially a natural colour variant that the trade ran with.
- UK south-east tap water is, unusually, close to ideal. Most fish we sell prefer soft-to-neutral water, but Malawi cichlids want it hard and alkaline - and the Thames Water region's supply is officially classified as hard [5]. For once, "just use your tap water" is often the right answer here, where it would be wrong for tetras or discus.
Mbuna vs peacocks vs haps - which Malawi tank are you building?
Lake Malawi cichlids split into three groups that keepers treat almost as different fish. You generally pick one group and build the tank around it - the table below is the decision. (Care basics like hard water, 24-28 °C and a big tank are the same across all three, so I've focused on what actually differs.)
| Mbuna | Peacocks (Aulonocara) | Haps (Haplochromines) | |
|---|---|---|---|
| Habitat in the lake | Rocky shallows | Sand at the rock-sand edge | Open water |
| Diet | Herbivore - graze algae; spirulina/veg-led [3] | Micro-predator - sifts sand for invertebrates | Predator - eats smaller fish & inverts |
| Temperament | Feisty, very territorial [4] | Calmer, but males defend a spot | Often calmer, but big |
| Colour | Both sexes usually colourful | Males vivid blue/orange/red; females drab | Males colourful; many large & impressive |
| Adult size | ~8-13 cm | ~13-15 cm | Often 15 cm+ |
| Tank / group strategy | Overstock heavily, lots of rock, harems [4] | Open sand + some rock; 1 male : 3-4 females | Biggest tanks; fewer, larger fish |
| Best for | Maximum colour & activity in a rock tank | A calmer, jewel-male display over sand | Experienced keepers with very large tanks |
The practical takeaway: don't mix mbuna with peacocks. The pushy, fast-feeding mbuna out-compete the slower peacocks at dinner and stress them. Build a mbuna rock tank, or a peacock/hap sand tank - not a blend. If you want maximum colour and movement and you have hard water, start with mbuna. If you want a calmer tank of glowing males over sand, go peacocks.
The Lake Malawi cichlids are one of evolution's fastest species explosions - hundreds of species from a recent common ancestor, with ongoing gene flow between the major groups [2]. That shared ancestry is exactly why a mbuna and a peacock can still interbreed in a tank, and why keeping look-alike species together risks muddy hybrids. Evolution hasn't finished separating them.
The specialist setup - get these four things right
Everything that makes a Malawi tank succeed comes down to four decisions. Miss any one and the tank struggles.
1. Hard, alkaline water - and leave it that way. Aim for pH 7.8-8.6 and high mineral hardness [3]. In much of the UK south-east your tap water already gets you most of the way [5]. If your water is soft, buffer it up with calcareous decor and substrate - crushed coral or aragonite sand, limestone or ocean rock - which dissolves slowly to hold the minerals and pH high [4]. Crucially, do the opposite of a soft-water tank: no peat, no botanicals, no RO water chasing a low pH.
2. A big tank with serious rockwork. Practical Fishkeeping puts the sensible minimum at a 120 cm / ~240 L tank, and recommends a pile of large rounded stones up to 30 cm across [4]. The rock isn't decoration - it breaks sightlines, gives each fish a territory and a bolt-hole, and (for mbuna) provides the algae-grazing surface they're built for. Stack it securely from the base glass up.
3. Overstock - on purpose - to spread aggression. This is the part that feels wrong. Malawi cichlids are territorial, and in a lightly-stocked tank a dominant male will single out one or two fish and bully them relentlessly [4]. Keeping a larger group spreads that aggression so thinly that no single fish takes the beating, and the constant activity stops hard territories forming. Keep each species as a harem - one male to three or four females - so breeding aggression is shared too.
4. Over-rated filtration. Overstocking only works if the water stays clean, so the bio-load needs powerful, over-specified filtration and good aeration [4]. A crowded tank on a weak filter is just a polluted war zone. This is why the "big tank" rule and the "overstock" rule are inseparable - you can't safely do one without the other.
The most common way people kill Malawi cichlids is treating them like community fish: a 60-100 L tank, soft water, and a few tetras for company. Every part of that is wrong for them. They want a large, hard-water, rock-filled, cichlid-only tank. If a shop ever suggests adding Malawi cichlids to your soft-water community tank "to add colour", that's bad advice - the two setups are genuinely incompatible.
Mbuna in stock this week
The rock-dwellers: bold, colourful, herbivorous and the engine room of a classic Malawi tank. Keep these in a big rock-filled tank, overstocked, as harems - and feed them green. The electric yellow is the gentlest place to start.
Peacocks & haps in stock this week
The open-sand jewels: Aulonocara peacocks, where the males blaze blue, orange and red and females stay plain. Calmer than mbuna, happiest over sand with some rock - and unlike mbuna they take a protein-richer diet. Don't mix them in with the mbuna above; build them their own tank.
Tank mates - Malawi-only, plus Synodontis
Compatibility for Malawi cichlids is narrow and that's deliberate. The honest list of what belongs in the tank is short: other Lake Malawi cichlids of the same group, and Synodontis catfish - hard-water African catfish from the same lake system that occupy the bottom and stay out of the cichlids' way. That's essentially it.
What does not belong - and this is the rule the whole page hangs on:
- Soft-water community fish - tetras, rasboras, most barbs, dwarf gouramis. Wrong water chemistry, and small enough to be bullied or eaten. Never combine them.
- Shrimp and small invertebrates. They're food.
- The other Malawi group. Don't put peacocks in with mbuna - the mbuna out-compete and stress them.
- Soft-water South American cichlids like angelfish or discus. Opposite water, opposite temperament - see our angelfish guide for why those are a separate world.
For the husbandry that ties it together, lean on these:
- Cichlid care guide - the foundation for housing territorial, semi-aggressive cichlids: territory, filtration and aggression management.
- Water chemistry guide - how to test and buffer hard, alkaline water, and why you treat a Malawi tank as the opposite of a soft-water tank.
- African cichlids hub - the broader Rift Lake shortlist, including the Synodontis catfish that genuinely belong with them.
Across much of the UK south-east, mains water is officially classified as hard [5], and that's a gift for a Malawi tank - it often means hard, alkaline water straight from the tap once dechlorinated [4]. If you're in a soft-water area (much of Scotland, Wales and the south-west), you'll buffer up with crushed coral or aragonite instead. Either way, test your tap water first so you know which camp you're in.
For a full Malawi mbuna build from an experienced UK aquascaper - hardscape, stocking and all - MD Fish Tanks' mbuna-tank tutorial is worth an evening [6]. It shows the scale of rockwork these fish really want, far more than most first-timers expect.
A second look - the peacock end of the spectrum
A Calico Peacock (Aulonocara sp. calico) - the calmer, open-sand side of Lake Malawi. Peacock males carry this jewel colour while females stay plain, and unlike the herbivorous mbuna they're micro-predators that take a protein-richer diet. Build peacocks their own tank rather than mixing them with pushy mbuna. Credit: Tropical Fish Co.
Peacocks are where a lot of keepers end up once they've run a mbuna tank - the colour is just as intense but the temperament is gentler, and a sand-floored Aulonocara display has a serenity a busy rock tank doesn't. The trade-off is that the females are unremarkable, so a peacock tank is really a tank of glowing males plus quieter females. It's also why look-alike Aulonocara shouldn't share a tank: the males will cross-breed if they can't tell each other's females apart.
When your cichlids arrive - acclimation for hard-water fish
Malawi cichlids are hardy travellers, but the move from our hard, buffered water to yours is the moment to be careful - a sudden swing in pH or hardness is the main risk for these fish, not the journey itself. Our licensed live-animal courier delivers in an insulated, oxygenated bag; your job is a calm, slow handover:
- Receive in a quiet, dimly lit room. Don't unbox on a bright worktop - check the bag temperature first.
- Float the sealed bag for 20 minutes to equalise temperature.
- Drip-acclimate for 40-45 minutes at 2-3 drops per second. Because these are hard-water fish, match your tank's hardness and pH to ours before they arrive, and let the drip ease them across any small remaining difference [6].
- Net the fish into the tank - never pour the bag water in.
- Lights off for a few hours and no food for 24 hours. A new cichlid will often sulk in the rocks for a day - that's normal settling.
A Malawi-specific tip: where you can, add new fish to an established colony with the lights off and after rearranging the rockwork slightly. Resetting the territories at the same moment new fish go in stops the existing dominant male from treating the newcomers as invaders of land he already owns. Have the tank fully cycled, hard and stable before anyone arrives.
Ready for more?
Lake Malawi cichlids reward you with colour no community tank can match - the catch is that you build the tank for them, not the other way round. Hard water, a big rock-filled aquarium, the right group, and a diet matched to mbuna or peacock. Get those right and you're set for the best part of a decade.
- Shop: African cichlids · South American cichlids · all tropical fish for sale
- Learn: Cichlid care guide · Water chemistry guide · Discus care guide
- Compare: Angelfish UK - the soft-water cichlid - the opposite end of the cichlid world, and why you can't mix the two · Tropical fish for sale UK
Every claim above is sourced - see the References block below. If you're not sure whether your water suits Malawi cichlids, or which species safely live together, ask us before you order. We'd far rather set you up with a tank that works than sell you a fish that won't thrive.
