I agree a 55 gallon tank/aquarium is a temporary holding tank. I am thinking biiiggggeeer. Those TS tanks are 6' across and 2' tall. Probably 200-250 gallons, guessing. I have an area where they would be in the shade all day. Another thought is I now have an empty cattle barn. Concrete floor and I could cycle rain through the tanks, and have electricity for filters and air pumps. Hmmm....