I think I am wording my questions wrong as I never seem to get the answer I think I would.
I am talking about pumps, not skimmers or powerheads, pumps. I am likely just misunderstanding, I was under the impression that each piece of equipment, like skimmer, reactors and the return, all needed their own pump? If my tank is 300l, do I just need a pump for the return that circulates 300lph? Or is there a desired amount of turnover suggested?