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So what should you keep with your Discus Fish? Different keepers have totally different opinions on this subject but here is my opinion.
In a breeding tank you should only keep Discus Fish and I strongly recommend you keep nothing else in there with them. Some people like to keep plecs and other sucker-mouth catfish, but I’ve had problems with them latching on and sucking to the Discus Aquarium Fish’s mucus covering. Algae eaters are also notorious for this.
However if you have a display tank then you want to make it look nice and have more than just Discus Aquarium Fish, I recommend you have a large shoal of small tetras like neon’s, cardinals and rummy noses. You can keep any peaceful, slow moving fish with discus, so long as they don’t dominate or out compete discus for food and space.
I believe that the Discus Aquarium should be geared toward keeping discus and other species generally do not require the dedication and water that discus need.
Some people have kept Discus Aquarium Fish together with angel fish, but other keepers would disagree with doing this for good reason. Angels can pass on disease to Discus Aquarium Fish and angels can grow large and bully Discus so take this into consideration when you’re planning your tank.
Rams are also a favorite to keep with Discus Aquarium Fish. I’ve had success with dwarf gouramis as well as pearls, though the blue and golden gouramis are bullies and should be avoided. When you get young Discus Aquarium Fish make sure you get a shoal as like other fish they need the security of a shoal around them.
I personally keep discus in a community tank, and I have had success with many different species, these have adapted to the warmer water and do not offer any direct competition to the discus.