Yes, I have kept them. Before I got into salt, I was into freash water and had lots of freash water tanks over the years. I bred both angels and discus, at one time. Some will eat their eggs, but sometimes you can get a pair or two that will raise the fry IF your water is great (they like a PH of about 6.8 and water plants like large sword plants, and other broad leaved varieties. They will also place their eggs on a piece of slate (better for removing the eggs, in case they begin to eat them). The fry eat the slime from the parents bodies. they secreet a sort of "milk", for the little ones, but you can buy a substitute food. It is important to have them by their selves or with other discus. There is nothing more satisfying than to watch them with their brood.