I have a 75 FOWLR it has 4 damsels, 1 trigger, 1 snowflake eel, 1 rock crab, 10 snails and 1 Tasmanian devil. The water is a little cloudy. I have 2 aquaclear 500. One with foam and charcoal and the other with bio cubes and foam. What could be causing this and what can I do about it?