Flowerhorn
Hybrid (Amphilophus x Paraneetroplus cross)
Min Tank Size
210L
Adult Size
30.5 cm
Lifespan
10 years
About
Flowerhorns are man-made hybrid cichlids developed in Malaysia and Taiwan in the late 1990s, bred primarily from Central and South American cichlid species including Amphilophus and Paraneetroplus lines. No wild population exists.
What draws people to them isn't just the looks, though the looks are genuinely striking. The prominent nuchal hump, called a kok, sits high on the forehead and is especially large in mature males. The body is typically a blazing mix of reds, pinks, and blues with iridescent pearl spots called pearling scattered across the flanks. Coloration varies enormously between bloodlines, from muted to almost unreal.
0 and moderate hardness. They're messy eaters and heavy waste producers, so robust filtration isn't optional. A 210-liter tank is the minimum for a single adult, and bigger is always better. Diet-wise, they'll eat quality cichlid pellets as a staple and benefit from occasional meaty supplements like krill or earthworms. Avoid overfeeding color-enhancing foods with artificial dyes.
What keeps people hooked on these fish is the personality. They recognize their owners, react to movement outside the tank, and develop what can only be described as individual habits. Some will display constantly. Others get grumpy if you rearrange the furniture.
Keeping one well is a commitment, but for a lot of hobbyists it becomes the most rewarding tank they've ever run.
Water Parameters
Temperature
°CpH
GH
dGHKH
dKHSwimming Level
Flow Preference
Keeping multiple Flowerhorn together
Flowerhorns are best kept alone; their extreme aggression makes successful long-term tankmates nearly impossible in most setups.
Compatibility
Keeping a flowerhorn with other fish is genuinely risky, and most experienced keepers don't bother. Solo setups are the norm for good reason. In very large tanks, some keepers have had short-term success with other large, robust cichlids behind a divider or in carefully managed introductions, but even these arrangements tend to fail eventually. Tankmates that look like competing cichlids are targeted first. Anything smaller is eaten or harassed to death. Large plecos are sometimes cited as tank companions but even that isn't a guarantee, a flowerhorn that decides it wants the pleco gone will find a way. Solo is safest.
Commonly kept with
Species this one is most often paired withCommonly tried but avoid
Often paired, but shouldn't beCare Notes
The biggest beginner mistake is underestimating filtration. These fish eat aggressively and produce waste to match, so undersized filters lead to ammonia spikes fast. Weekly water changes of 30 to 50 percent are standard. The second mistake is expecting tankmates to work out fine. They almost never do. Third, the kok size people often chase through supplements and special diets is largely genetic, so chasing it through gimmick foods usually just means an unhealthy fish. Buy from reputable breeders, feed quality staple pellets, keep the water clean, and the fish will develop naturally.
Behavior & Aggression
Flowerhorns are among the most aggressive cichlids in the hobby, full stop. Aggression isn't situational or stress-triggered, it's baseline. They claim entire tanks as territory and will attack anything that enters that space, including reflections in the glass. Males are worse than females but females are no pushovers. The aggression intensifies when they're in breeding condition, if they can see other fish through adjacent tanks, or when a new object is introduced. There's no reliable way to tone it down through tank setup. It's just who they are.
Things to Know
- Must be kept alone in almost all cases, will kill tankmates
- Can jump, a secure lid is required
- Hybrid status means health can vary widely between specimens
- Digs heavily, substrate and decor will be rearranged constantly
- Aggression spikes dramatically during breeding conditioning
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