I too am avoiding "one more tank". I just sold my 55 gal AND big canister filter to a friend (and talked her into putting axolotls into it!), so I don't put more animals into it. Right now, I have 1 empty 20 long, which I'm going to put my musk turtles into, leaving me with an empty 15 gal as a hospital tank. I have bad ETS (empty tank syndrome), so if I don't have empty tanks, I'm not tempted to fill them.