I'd like to setup an indoor pond to house a pair of stingrays in. I can get the 300 gallon rubbermaid stock tank locally for about $200 http://www.tractorsupply.com/livest...sories/stock-tanks/stock-tank-300-gal-2229935 I plan on putting it in the corner of the living room, and using some stone to hide that it's just a black stock tank. I think with some nice stone, and a few plants it can become an amazing indoor pond =]I'm just confused as to what would be the best method to filter this. I've debated an fx5 or 2 of them, but then I would have hoses for the intakes and outputs coming up over the edges. Which I suppose would possibly be hidden by the stone depending on how high I stack the stones.Wodnering if anyone could offer any suggestions/opinions for filtration on this thing. It says on the description of the website that the tank has a drain, but I'm not sure of what height it's located.