I have a 10" Intex inflatable and looking to use in the future for the same thing...I have run smaller pools as ponds for goldfish and had no issue...out of curiosity....have the freshwater set ups been fine and the saltwater ones had serious issues?????...i hear of guys using them for koi and no problems....Im wondering about the set up.......i was worried about a salt water set up "eating" into the liner more so than a freshwater set up where the bacteria can form a "layer" over the lining so to speak...just an idea...as they would be different bacterias in frshwater and saltwater...