My godfather has a Koi Pond, but he has well over 50 Koi in there and needs to get rid of some. I was thinking about taking 1 of his 1"-2" Koi fry (they breed like crazy). Would 1 Koi fish alone be ok in a 30 gallon for a while until I can upgrade again and get a bigger tank for it?? He has new fry every summer. And if I do get the Koi, how big of a tank would I need as a min?? I tried looking it up, but I get a different answer in every site.