I bought a pound of FHM and saved out a few for the aquarium. Only one in the tank has died since summer. Initially, one was about 3x the size of the rest, but they have all grown, and a couple are about as big as the big one. I've put only a coffee cup on its side, a small eel grass plant, and big sea shell in with them. They fight over who gets to be in the cup. The big ones are turning black, and I guess that's an indication they want to spawn. I feed them half goldfish flake food and half tropical fish flake food. They also chew on the plant, and I added some pond water and the water has a bit of a yellow-green cast. I had put the bulk of the minnows in a 95 gal stock tank during the summer and fall. Quite a few died until I added pond water, and after that, only a few died.