could i have a japanese Koi fish one as a pet in a fish tank if i got the right size i know they live in ponds but would this be possible also i heard a 55 gallon tanks will do i heard it form ppl who own koi in 55 gallon tanks or could i have a kitty pool in my room and raise them in that? for like 1-2 years then sell them before they get to big and die that was my plan cause ive known ppl who have done that!in there rooms without 400pound ponds