Apistogramma Care Guide: Tank Size, Diet, and Compatibility (2026)

Apistogramma Overview

The Apistogramma (Apistogramma cacatuoides) is a rewarding species suited to aquarists with some experience, native to South America. As a freshwater carnivore, this species has earned its place as a staple in community tanks, species-only setups, and planted aquariums worldwide. The Apistogramma can be semi-aggressive, especially when establishing territory or during breeding. With proper care and appropriate water conditions, Apistogrammas can live for several years and become a rewarding centerpiece — or supporting cast — of your aquarium.

According to FishBase's species profile, the Apistogramma cacatuoides is widely distributed across South America and has been selectively bred in captivity for decades, resulting in a robust trade fish that typically adapts well to aquarium conditions. That said, replicating natural water parameters as closely as possible always produces the healthiest fish.

Tank Requirements

The Apistogramma requires a minimum 20-gallon aquarium. Crowding this species into too-small quarters leads to stress, aggression, and disease — the most common cause of failure with this fish. Budget for a hang-on-back filter rated for the tank volume, or a small canister filter to keep the water clean and well-oxygenated.

• Minimum Tank Size: 20 gallons
• Temperature: 73-82°F (ideal: ~77°F)
• pH: 5.0-7.0 To lower pH toward the 5.0-7.0 range, consider RO/DI water, driftwood, or Indian almond leaves. See our guide on how to lower pH in your aquarium.
• Filtration: A hang-on-back filter rated for the tank volume, or a small canister filter

A fine to medium-grain substrate is appropriate for most specimens, with some species preferring sand or smooth gravel. Once your tank is fully cycled, perform 20–30% water changes weekly to maintain stable parameters. Stability matters more than hitting exact numbers — sudden swings cause far more harm than gradual drift.

Diet & Feeding

In the wild, Apistogrammas are predators that hunt live prey. In captivity, replicate this with high-protein foods. High-quality carnivore pellets, frozen bloodworms, frozen brine shrimp, mysis shrimp, and occasional live foods are all excellent choices for this species.

Feed once or twice daily, offering only what they can consume in 2–3 minutes. Remove uneaten food promptly. Variety is key — rotate between different protein sources to prevent nutritional deficiencies.

Compatibility & Tank Mates

The Apistogramma is semi-aggressive and can be territorial, especially in smaller tanks. It generally coexists with robust, similarly-sized fish that won't back down or get bullied.

Good tank mate options from our database include African Dwarf Frog, Angelfish, and Black Phantom Tetra. Avoid timid, small, or long-finned fish that may become targets. Don't keep two males together in smaller tanks.

Common Health Issues

The Apistogramma is susceptible to disease when conditions are suboptimal, but no aquarium fish is immune to illness. Prevention through clean water and a varied diet is always better than treatment. For detailed species-specific health notes, SeriouslyFish has an excellent care sheet for the Apistogramma.