A few weeks ago I caught a Pumpkinseed that put in my 18 gallon aquarium. He seems to be doing fine and is eating worms I dig up. I intend on getting a bigger aquarium for him (75gal), but I need to know if it okay to keep him in his existing tank for a few months until I do so, or should I go out and buy a kiddie pool or something for him to live in for a while?