Can You Keep Koi in Fiberglass Ponds? When looking into keeping Koi, you may come across quite the mixed bag of opinions. Some people swear by live feeding while others opt for block style foods. Some love deeper ponds while others only like a few inches of water. It can all seem like quite a lot to take in.One of the most heated debates in the Koi care community has to be surrounding the housing of koi fish. Be it in a pond, filtered system, or tank, everyone seems to have their own take on the matter. Let’s take a look at...