I emptied my first of three outdoor tubs Saturday. I started it with three female purple Moscow guppies, a sponge filter, and dwarf water lettuce (which does not stay dwarf outside in a tub). I had fifty fish, give or take, when I emptied it. It was a 40 gallon; the other two are 110 gallons each and will be emptied soon (they have heaters). All the fish looked great! Summer tubs are great if you haven't tried them.