They are compatible with most community fish, even angels. It was once said that angelfish and discus should not be placed in the same tank. Supposedely angels may carry a pathogen that harmful to the discus, but many people, inlcuding myself as with other discus breeders, house angels and discus in the same tank.
When selecting discus...
- Buy from a local breeder, not an LFS. Local breeders carry a healthier stock and can help you with any questions you have on them.
- Discus do better in groups of at least 4-5.
- Select the most active (during feeding) discus with vibrant colors NOT the one that looks sick, thin, dark, or always hiding in the corner.
- Juveniles at about 2" or so are cheap, but require allot of maintenance. They are best raised in a BB (Bare bottom) tank by themselves, due to their constant feeding and water changes.
There are additional things to look for in a discus, which can be very healthy and happy fish, but some people are more selective for breeding high quality discus. If a discus does not show any of these, they can still be happy and healthy and can produce happy and healthy offspring. These are...
- Eyes are proportionate to the body size, not too big. Discus with big eyes compared to it's body size is usually a sign of stunted growth.
- Very little or no peppering. Keep in mind, discus strains that do not have stress bars, will show some kind of peppering. Peppering are black spots, normally shown near the nose/mouth area and various other spots in the body.