http://forum.aqua-fish.net/ A forum devoted to aquarium fish, plants, techniques and fish keeping as a whole. en http://forum.aqua-fish.net/?topic=discus-tank-fighting-and-new#1 Ok so i hope this is where i can add a question.... My baby girl is due tuesday well she is coming tuesday cause how far along me and mywife are.. But back to the big question. I made and put in a fish tank for her room it is a 20 gal. I have a bigger then needed one for a 30 gal tank 30 gal air pump and i had one discus i had in a diff tank for a while. Went to my fav fish store owned by an grandma and grandpa good nice people. Told him im thinking of just making a discus tank for my girls room. He then told me i should get more at least 2 so i would have 3.. 120 bucks late i have 2 more one was about 1.5 and the other is about 2. I put them in there 1st then added i had the one i had before but is 2in i had him in a molly tank and he was doing well. The prob i am having now the smaller of the 3 is a diff color all very light blue. The others and like a lite orange and turquiose stripes.. They seemed to buddy up and now i have seen that the one i had before is now biting at the light blue one to the point he is turning black.... I dont see him eat much but after a while it goes away and he goes back to his color. What should i do????? I know now from reading my tank is a little small for them i have just tonight tryed moving everything around. Biggwhite 2011-06-17 http://forum.aqua-fish.net/?topic=discus-tank-fighting-and-new#2 If one of the Discus is being bullied by the other then the only way to stop this is to remove the weaker fish before it gets bullied to death. In nature they do form a pecking order but there is not enough room in your tank for Discus as they need to be kept in small groups of at least 6 to disperse any agression between themselves, Each Discus require as least 10 gallons of water volume so the smallest tank that they can be housed in is a 60 gallon. mickey 2011-08-23