Keyhole Cichlid Care Guide: The Peaceful Cichlid for Community Tanks
The keyhole cichlid (Cleithracara maronii) is the gentle giant of the dwarf cichlid world — a shy, peaceful, sandy-colored fish named for the keyhole-shaped marking on its side. If you’ve heard that cichlids are too aggressive for a community tank, the keyhole is the exception that proves the rule: it’s one of the calmest cichlids you can keep and a wonderful centerpiece for a peaceful aquarium. 🐠
Keyhole cichlid at a glance 📋
Keyholes are South American cichlids reaching about 4–5 inches. They’re a soft beige to tan with a dark vertical eye-stripe and the signature keyhole blotch on the flank, which can darken or fade with mood. They’re slow, deliberate swimmers and famously timid — a startled keyhole will pale and hide. Expect a lifespan of 7–10 years with good care. As one of the most peaceful members of the family, they’re a great pick from our best dwarf cichlids for a planted tank roundup.
Tank size & setup 🌿
A single keyhole or a bonded pair is comfortable in a 30-gallon tank; for a community or a group, 40–55 gallons is better. They’re shy fish, so aquascape for security: driftwood, caves, and dense planting around the edges with open sand in front. Soft substrate suits their gentle foraging. Our best fish for a planted aquarium and best fish for a 55 gallon tank guides have setup and stocking ideas.
Water parameters 💧
Keyhole cichlids prefer soft to moderately hard, slightly acidic to neutral water (pH 6.0–7.5) and temperatures of 72–80°F. They’re reasonably hardy once settled but sensitive to poor water quality, so a fully cycled, well-maintained tank is essential — if you’re new to that, read our guide to cycling a new aquarium. Keep nitrates low with regular water changes and avoid sudden swings.
Diet & feeding 🍚
They’re omnivores with a slight preference for protein. Offer a quality sinking pellet or flake as a staple and supplement with frozen or live foods like bloodworms, brine shrimp, and daphnia. Because they’re slow, polite eaters, make sure faster tankmates don’t outcompete them at feeding time. A small sinking cichlid or community pellet works well, and our best fish food for community tanks guide has specific picks.
Temperament & tankmates 🤝
This is the keyhole’s superpower: it’s genuinely peaceful and rarely aggressive, even when spawning. The catch is its shyness — boisterous or nippy tankmates will stress it into hiding. Pair keyholes with other calm community fish: peaceful tetras, rasboras, and sturdy bottom dwellers like corydoras catfish (see also our corydoras tankmates guide). Avoid large, aggressive cichlids and fin-nippers.
Great in-stock tankmates we’d pair with a keyhole include ember tetras and harlequin rasboras as gentle dither fish up top, julii corydoras working the sand below, and another calm centerpiece like a Bolivian ram if your tank is roomy. Browse the full tetras, rasboras, and corydoras collections for more peaceful options. For a deeper roster, our freshwater tetras guide covers schooling species that suit a calm community.
Breeding 🥚
Keyholes are open-substrate spawners and exemplary parents. A bonded pair will clean a flat rock or broad leaf, lay eggs, and both parents will guard and fan the eggs and fry — all without the aggression typical of breeding cichlids. They form lasting pair bonds, so the easiest route to a pair is raising a small group together and letting one form naturally. Stable water and a calm tank encourage spawning.
Common care notes ⚠️
The main “problem” with keyholes is simply their timidity — a fish that hides constantly usually needs more cover, more dither fish, or calmer tankmates rather than any medical treatment. Sudden paleness is a stress signal, not necessarily illness. Go slow with acclimation, keep the tank peaceful, and they’ll gradually grow bold and personable.
Is the keyhole cichlid right for you? 🤔
The keyhole is an excellent choice if you want the personality of a cichlid without the aggression — it suits beginners stepping up from a community tank, peaceful-planted-aquarium keepers, and anyone who wants a long-lived centerpiece that won’t bully tankmates. It’s less ideal if you want a bold, always-out showpiece (keyholes can be wallflowers, especially when young) or if your tank already houses pushy, fast-moving fish. Give it cover, calm company, and a little patience, and it rewards you with years of gentle, curious behavior. Not sure how it compares to other gentle cichlids? Our German blue ram guide covers another peaceful dwarf cichlid worth considering.
Keyhole cichlid FAQ ❓
Are keyhole cichlids aggressive? No — they’re among the most peaceful cichlids in the hobby and rarely bother tankmates, even while spawning. Their bigger issue is shyness, not aggression.
How big do keyhole cichlids get? About 4–5 inches as adults, with males slightly larger and showing longer fin extensions over time.
Can keyhole cichlids live in a community tank? Yes — they’re one of the best cichlids for a peaceful community, as long as tankmates are calm and not fin-nippers. Add dither fish like tetras or rasboras to help them feel secure.
How many keyhole cichlids should I keep? A single fish or a bonded pair is fine. If you want a pair, raise a small group of 4–6 young fish together and let a pair form naturally.
What do keyhole cichlids eat? A quality sinking pellet or flake staple plus frozen or live foods like bloodworms, brine shrimp, and daphnia. Make sure faster fish don’t outcompete them at feeding time.
The bottom line
The keyhole cichlid is proof that “cichlid” doesn’t have to mean “aggressive.” Peaceful, long-lived, and full of subtle charm, it’s an ideal centerpiece for a calm planted community — just give it cover, gentle tankmates, and clean water. Looking to add one? Browse our South American cichlids and dwarf cichlids collections, or stop by Tropical Treasures in Cheyenne (307-369-1118) and we’ll help you pick a healthy one. 🐠