Grins. I really value your opinion. My short time in the SW world has been moved along painlessly by reading your answers for a while now. So my question is this... I have two Bio-wheels 200's on a 55g. They are causing tiny bubbles in the water column. I don't have any powerheads as of yet. Are those bubbles bad? If so how do I make them they go away? It's a FOWLR system. Anyone else is more than welcome to chime in...