I heard that if you put a bubble wall (pretty much an airstone) in a saltwater fishtank that this would decrease or increase the co2 levels in the water, which could effect the coral. In other words they won't like it much. If this is true can i control the co2 like the Ph is controlled. I really think a bubble wall will be a nice feature in my tank. It is only a 215ltre/55 gallon fish tank.