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For the last 3 weeks I've been going through an annoying cycle. At lights on my water is slighly cloudy - front to back view is ok but looking down the tank is distinctly "hazy". After a few hours of lights and CO2 the plants are pearling nicely and the water is crystal clear! Next morning...

Its not BGA, its just normal algae like you get on hardscape and glass. Doesn't grow on my aqauasoil, just on the sand. I've got no algae anywhere else (Ottos, snail and Shrimp are doing a good job) and its driving me nuts. How do people keep it clean - do I need some bottom dwelling fish to...