I've had a chain pickerel for about a year now in a 45 gallon bow front aquarium and it is almost 7 inches. The 7 inch pickerel is by itself. In another 40 gallon breeder tank I've set up a native tank with a 3 inch pickerel, a 2 inch largemouth bass, a group of three 2 inch pumpkinseed sunfish, a pleco, and a yo yo botia. The only reason I put the yo yo in with my native tank was to control the snail population. Now there are hardly any snails if any at all. What can I use in my larger pickerel's (named T-Rex) tank to also control the snails?? Keep in mind T-Rex eats anything that touches the water