To put it this way, I did well water for almost 4 years. Never had problems. All the fish were happy, corals opening fully, ect. Only thing was I always looked at it and felt like it was just missing something... Coraline algae never took off, growth rate was not as fast as others and every day I had a light coat of algae on the glass and has to use the magnet to clean it off. It never looked like it does in all the pictures of everyone else's set up. If you go far back into my pictures you can see what I mean with my 72 bow. It was nice, but never perfect. The day I broke it down and did a new tank, I said I'll give the whole Rodi thing a shot. Let's just say, I found the missing factor of the tank.