Thanks 4 the reply, I only use R/O water so that shouldnt be a problem. Having a salt water tank has given me a bit of a learners curve in the lighting/water chemistry department. It's Almost the same hobby, trying to keep corals alive. Speaking of which FYI for anyone looking for cheap lights,RO maker, filters, test kits, ect ect join a local salt water tank forum and ask around, there is always someone breaking down an old tank & wanting to sell their supplies cheap.