I buried a 80 gallon tank in my back yard, plastic garbage can will do, then built a wood frame around it and a peice of plywood with hinges for a lid. Put a lock on it so kids couldn't fall in it, and a couple bubblers Bam instant cold water minnow tank.I could keep minnows alive all year round. I would by my minnows by the pound...cheaper that way and the key to keeping them alive was not to feed them. Also try to put the tank in a somewhat shady place...Hope this helps ...Chuck