| Re: Benthic zones in sump.
Well thank you BoomerD and Witfull, this was worthwhile as I have learned something. My sand bed is 4 '' deep and the ? zone is light free, not sure if I could ever arrange increased pressure.So getting back to my question. Is there a benefit in providing an area for filter feeders and sponges.I must confess the mechanical explanation has been harder than I could imagine and leads me to think this is not a common practice |