I have a 55 gal planted tank with two discus in it. One of the Discus is really growing, the other not so much. I have had them for about 3 months. The big one bullies the little guy. Any ideas on how to stop this?
Discus should be kept in groups of 5 or more from my experience, unless you have a proven pair and want to keep those alone. If one is bullying the other, they are not a pair and you need more discus to spread out the aggression. Don't forget, they are cichlids.