I have an AquaC EV-120 with a Mag5 pump for my 90g reef tank. I was wondering what the optimum air valve setting was.... I currently have it set all the way open to let in the most air, which creates a very wet foam. I have recently read that people strive for a dry foam (which would mean I would have to close the air valve most of the way).... In order to get rid of the most "bad stuff," what is the best setting? Thanks.