i dont have a bigger tank to upgrade to except my 45 gallon tank but it has 2 marble angelfish a figure 8 puffer fish 3 clown loaches 2 rams 1 hifin pleco and 2 glofish, so that tank is pretty much full plus i would think the angels would beat up on a discus. once i move i have convinced the wife that i need a bigger tank so maybe i'll have to wait to get a discus when we move.