go out and catch a couple of tiny perch, and bass, and sunfish, maybe a little cat, and have a ball. ive got a baby snapping turtle right now..so no fishies left.
most interresting tank I've seen was a crayfish a painted turtle and a bunch of gold fish . Just keep adding goldfish .. Crayfish would just freeze motionless while gold fish swam closer and closer .. Really enjoyed watching that .. kinda sick I guess.