if your afraid to try discus then don't even think about Altums. the hard part is finding them. acclimating them is'nt the easiest thing to do either. I would do six wild discus. I have eight adults in my 120 gal. this tank is my first try with discus. been running for about 15 months and I have never medicated them for anything. I think they are much hardier than domestics. give any discus very clean water, quality food, and the right tankmates and you won't have any problems. if your willing to spend a little more time caring for these fish, then you will find that they are not hard to keep. one tip; get them from a reliable source. very few lfs have quality discus. also remember that juvies under 3" are much harder to care for than larger fish.