http://www.ebay.com/itm/MADE-IN-USA-6-STAGE-Aquarium-Reef-Reverse-Osmosis-Water-RO-DI-80-GPD-MEMBRANE-/170949880163 this is the unit i have other then mine is a 36gpd ro filter witch i will be up grading to an 80gpd
you never want to add a bigger clown then what is in your tank because if one you already have in your tank has done the change to female the one you put in will kill her to become the female