ok the situation is my tank is 260 g houses a breeding pair of stingrays and are a hi waste out put fish. would using a swiming pool sand filter and pump be ideal ? looking into a few options here. first is the possiblity of going 100 % sand filter depending on how much they can handle. Anouther pissibility is maybe having it run with in and out to my sump so the watter passes mech filtration aswell. the idea here is that the sand filter would be 100 percent pure biological no maintance needed kinda idea. what do you guys think looking for some ideas for sure.