Guide
Good setups for a 200 litre tank
200 litres (~53 US gallons) is a popular size in the UK and Europe. Room for mixed communities, centrepieces, or a cichlid project. Run combinations through our stocking calculator.
- Size in real terms: 200 litres is roughly 53 US gallons - big enough for a genuine community, a centrepiece display, or a cichlid project, but not so large that running costs become painful.
- Match fish to your tap water: check your pH and hardness before choosing species, not after. Soft-water tetras and hard-water mbuna are not interchangeable.
- Filtration should be oversized: aim for a turnover rate of 8-10× the tank volume per hour - 1,600-2,000 litres per hour for this size.
- Cycle before you stock: a fully cycled tank has established colonies of beneficial bacteria converting ammonia to nitrite to nitrate. Skipping this is the single biggest cause of new-tank fish deaths.
- Stock in stages: adding all your fish at once spikes ammonia and crashes the cycle. Add one group, wait two to three weeks, test, then add the next.
- Weekly maintenance is non-negotiable: 20-30% water changes weekly keep nitrates below 20 ppm and your fish healthy long-term.
What a 200 litre tank actually gives you
A typical 200 litre tank runs around 100 × 40 × 50 cm, though dimensions vary by brand. That footprint matters more than the volume figure for territorial fish - a long, lower tank gives mbuna more ground to split up; a taller one suits angelfish. Check actual dimensions, not just the headline litreage.
At this size you have genuine stocking flexibility. You can run a relaxed community of mixed schooling fish, build a display tank around one or two statement species, or keep medium-sized cichlids properly without cramming them into something too small. What you can't do is keep everything - pick a direction and commit to it before buying fish.
Most stocking problems in 200 litre tanks come from scope creep - people start with a sensible plan, then add "just one more species" every few weeks. Decide on your setup before you buy your first fish, and stick to it. A stocking plan written down in advance is worth more than any piece of equipment.
Setup 1: the mixed community
This is the most versatile use of a 200 litre tank and a great fit if you want variety and movement at every level of the water column.
A workable stocking plan
Start with a mid-water schooling layer: 15-20 Paracheirodon axelrodi (cardinal tetras) or Hemigrammus bleheri (rummynose tetras) give you a strong visual anchor. Add a second schooling species for contrast - 12-15 Trigonostigma heteromorpha (harlequin rasboras) or cherry barbs work well. For the bottom, 10-12 Corydoras sterbai or Corydoras paleatus - corydoras need to be kept in groups of six minimum to display natural behaviour, and they're social enough that ten or twelve is better. Round it out with a single centrepiece: a pair of Trichogaster leeri (pearl gouramis), or a trio of dwarf gouramis (Trichogaster lalius), or a single common bristlenose pleco (Ancistrus cirrhosus) as algae control.
That's a full tank. Don't then add another school because there's "still space." Use your free stocking calculator to check bioload before buying.
Water parameters for a community
Soft, slightly acidic water suits this combination best: pH 6.5-7.2, hardness 5-12 dGH, temperature 24-26 °C (75-79 °F). Most community tetras and rasboras come from blackwater or soft-water Amazonian rivers. They'll survive in harder water, but they don't thrive in it and you'll see washed-out colour and shortened lifespans.
Mixing cardinal tetras (soft-water fish) with species that need hard, alkaline water - livebearers like mollies or platies, for example - then wondering why one group always looks stressed. Check the parameter overlap of every species before you commit. If there isn't one, pick a different fish.
Filtration and planting
A canister filter rated for at least 1,600 lph is the cleanest solution. Two hang-on-back filters work if you already own them. Plant densely - Echinodorus spp., Vallisneria, and floating plants like Salvinia or Amazon frogbit reduce nitrate, reduce stress in fish, and make the tank look far better than bare glass. A well-planted 200 litre community tank with correct parameters is one of the most satisfying things in the hobby.
Setup 2: the centrepiece display
Here you're building the tank around one or two visually dominant species, with supporting fish that complement rather than compete.
Angelfish display
Pterophyllum scalare (common angelfish) are the obvious choice for a taller 200 litre tank. A group of four to six juveniles will pair off as they mature - expect aggression when spawning happens. Keep them with larger, fast-moving tetras: rummynose, black neon (Hyphessobrycon herbertaxelrodi), or Congo tetras (Phenacogrammus interruptus). Avoid small neon tetras with adult angels - they fit in an angelfish's mouth and will eventually disappear. Add 10-12 corydoras on the bottom and a bristlenose pleco.
Temperature for angelfish sits at 26-28 °C (79-82 °F) - slightly warmer than a generic community, so choose tankmates that tolerate the upper end of that range.
If you want a cleaner display, two or three angelfish with a single large school of 25-30 rummynose tetras and a bristlenose pleco is visually striking and easy to manage. Sometimes fewer species makes a better tank.
Pearl gourami display
A pair of pearl gouramis (Trichogaster leeri) as the centrepiece with two contrasting schools - say, 15 black phantoms and 15 lemon tetras - and 10 corydoras gives you a calmer, more elegant tank than an angel setup. Pearl gouramis are hardier than dwarf gouramis and less prone to the iridovirus issues that plague tank-bred T. lalius stock. Water: pH 6.5-7.5, 23-27 °C (73-81 °F), soft to moderately hard.
Setup 3: cichlid tank
200 litres is genuinely workable for cichlids if you choose the right species and accept that it's not large enough for everything.
South American cichlids
A bonded pair of Heros efasciatus (severums) works well - they're personable, not excessively aggressive outside of spawning, and grow to around 20 cm. Give them a few dither fish (a school of larger tetras or giant danios) to reduce pair aggression, and a bristlenose pleco for algae. Severums want soft to moderately hard water, pH 6.0-7.5, 23-27 °C (73-81 °F).
Alternatively, keyhole cichlids (Cleithracara maronii) are gentle enough to keep in a more community-style setup. A pair with tetras and corydoras is an underrated combination.
Oscars (Astronotus ocellatus) are too large for a 200 litre tank long-term. They reach 30-35 cm and produce enormous waste. Don't let a pet shop sell you a 5 cm juvenile for this size tank.
African cichlids: Malawi mbuna
Mbuna work differently from South American cichlids. You overstock deliberately - a colony of 15-20 mixed species in 200 litres spreads aggression so no single fish is targeted relentlessly. Use a species mix with different mouth shapes to reduce competition: Labidochromis caeruleus, Pseudotropheus acei, and Cynotilapia afra are commonly recommended beginner mbuna. Keep one male to multiple females per species where possible.
Hard, alkaline water is non-negotiable: pH 7.8-8.6, hardness 10-20 dGH, temperature 24-27 °C (75-81 °F). Mbuna are completely incompatible with soft-water community fish - don't try to mix them.
Filtration needs to be heavy. Two canister filters or a canister plus a large sponge filter. Mbuna eat and excrete constantly; you need the biological capacity to handle it.
Tanganyikan species
A species tank for shell-dwelling cichlids (Neolamprologus multifasciatus or N. brevis) is a fascinating alternative - a colony of 10-15 multis in a 200 litre tank with a sand substrate and dozens of empty snail shells gives you complex social behaviour in a manageable package. Same hard-water requirements as mbuna.
For a cichlid tank in this size, err toward the higher end - 10× (2,000 lph) - because the bioload is significantly heavier than a community setup.
Getting the cycle right before you stock
This isn't optional background information - it's the difference between fish surviving and dying in the first two weeks. A new tank has no established bacteria to process fish waste. Ammonia builds up, nitrite spikes, and fish suffer chemical burns to their gills before you can see anything is wrong.
A fishless cycle using pure ammonia takes four to six weeks but is the cleanest method. Using a bacterial starter culture alongside it can shorten this. Read the full process in our guide to how to cycle a fish tank, and understand the underlying chemistry in the nitrogen cycle explained. Don't skip it because you're impatient - you'll pay for it.
Log your ammonia, nitrite, and nitrate readings through the cycling process in App-aquatic. Being able to see the nitrite spike and fall on a chart tells you clearly when the tank is ready - far more reliable than guessing by date.
Ongoing maintenance
A 200 litre tank doesn't run itself. Plan for 30-45 minutes of maintenance per week: a 25-30% water change, gravel vacuuming (or gentle disturbance of a planted substrate), filter media rinse in old tank water every four to six weeks, and a quick glass wipe. For specifics on frequency, see how often to do water changes.
Test water parameters weekly when the tank is new, and at minimum monthly once it's established. Check pH, ammonia, nitrite, and nitrate as a baseline. If you're keeping hard-water species, test KH and GH too. Our guide to aquarium water parameters covers the numbers you're aiming for.
Track your parameters and get care reminders with App-aquatic.
Get the free appHow many fish can I keep in a 200 litre tank?
It depends entirely on the species. A community of small schooling fish (tetras, rasboras, corydoras) might total 40-50 individuals without overloading the filter. A pair of severums with dithers is fewer fish but far heavier bioload. Don't use the old "1 cm of fish per litre" rule - it's useless. Use a proper stocking calculator and test your water regularly.
Can I keep discus in a 200 litre tank?
Technically possible but not ideal. Discus (Symphysodon spp.) are sensitive to water quality, need temperatures of 28-31 °C (82-88 °F), and do best in groups of six or more. Six adult discus in 200 litres is pushing the boundaries of what the filter can handle and leaves little room for error. Most experienced discus keepers recommend 300 litres minimum for a proper group. If you want that challenge, go in with eyes open.
Can I mix African and South American cichlids in a 200 litre tank?
No. African mbuna need pH 7.8-8.6 and hard water. South American cichlids like severums or keyhole cichlids need pH 6.0-7.5 and soft to moderately hard water. There is no meaningful overlap. One group will always be kept in wrong conditions, and the stress will show in disease susceptibility and shortened lifespans.
What's the best filter for a 200 litre tank?
A canister filter is the most practical choice - quiet, high capacity, out of the tank. For a community setup, a single canister rated at 1,600-2,000 lph is sufficient. For cichlids, run two filters so you have redundancy if one fails and combined biological capacity to handle heavier waste. HOB filters work but require more frequent maintenance at this tank size.
How long does it take to cycle a 200 litre tank?
Four to six weeks for a fishless cycle, sometimes longer in cold rooms (bacteria work more slowly below 20 °C). Using a bacterial starter product like Seachem Stability or Dr. Tim's can speed things up, but you still need to test ammonia and nitrite to confirm the cycle is complete - not just assume it based on the product's claims. The cycle is done when you can add a full dose of ammonia and it converts to nitrate within 24 hours with zero ammonia or nitrite remaining.
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