if you ask me that sized pond is great for those fish but don't add any others as all of them get pretty huge........but i still think i will make a plywood tank as if i'll keep red tail in pond i only can see it from above while seeing them through glass is cooler and any other fish...i am thinking on doing a plywood tank but can someone say me what should i do ? i will make a plywood box , cut the glass part from the front part...stick all walls together by silicone and screws and the steps i don't know are : what should i do after : add a coat of fiberglass then epoxy resin or epoxy resin and fiberglass after or only one of them and if only one of them which ? please help me doing the correct paths as i need to now if i should use fiberglass first and expoy then or epoxy first or only one of them...if can someone help me with this i'll really appreciate that as if i know to do the correct paths i can do the hole tank