Sooo, I have this issue. I currently have a forty gallon breeder tank and am planning on eventually building a custom aquarium at least two or three times the size and in the deminsions I want. The issue is my local fish store recently got in the centerpiece fish I have wanted FOREVER! A baby black ghost knife fish, he is only about three inches long and BEYOND ADORABLE. I know these guys get like almost two feet long but I am in love with the little guy and was wondering if he can live in the forty gallon breeder temporarily while I build his permanent home.