I’ve been using a 75 for years. But I also have a 2270 gallon pool / pond in the yard for out grows. I’ve gone through Bass, Eels, Long Ears, Blue Gills, Rock Bass and you name it I have had it a time or two. Right now I have six baby Chain Pickerel and a mid size Pirate Perch and some Madtoms in the tank. Outside in there are four nice Cats (two black bulls and two yellow bulls) and a number of Breem. I have a good Mosquitofish colony going for feed for my Pickerel. When the cats get to big for the pond I guess they will end up on the table.