we have a hot tub in my backyard thats been siting for about a year now because the water heater is broken. we have always played around with the idea of turning it into a pond, but now me and my dad are geting serious about it. its about a 3-4 person and looks almost identical to this one. we know we have to plug the holes were the jets come out, and we were thinking we could use two of them for the filter. we are planning on using another fish tank we have for the sump. any ideas / comments?