I bought a 120 gallon (4x2x2) that I am converting to FW. I'm about finished with my wet / dry so I needed to go ahead and get this question out of the way. Will Corraline algae cause any problems in FW? There are a few places in my overflow which I cannot reach to clean it out (ie between the inner and outer walls of the over flow). I would assume it would be alright, but I want to make sure it will not alter the PH and so forth.