yes he is right, discus need at least 10 gallons of water a piece, but that is when they are a little older than 2". if you insist, then you would have to buy about a 55 or 75 gallon tank for them once they reach about 3-4 inches. Breeders overstock their tanks, and feed heavily, which is what it sounds like you want/need to do. Coming with those standards you would have to do water changes every day to every other day. it may not sound like much now but it will catch up and be a pain in your @$$. i would start in a larger tank with all of them if you planned to do discus...once again...start off slow and dont rush into anything. it will only screw you later. other than that!!! lol well - discus can be very beautiful and if you scratch their back they'll scratch yours!! you have a couple now dont you?