Today, I tossed my fathead minnow in with Sparky. It was a freebie long ago and it's kind of mean. When it was in my 29, it would headbutt my dojos away from their food. So far, Sparky has ignored it. If he can learn to co-exist with other fish, I plan to put some angels in there. But if minnowboy goes missing, Sparky will be a loner.