My refugium is in the sump
but with some baffels in the sump to slow down the flow and reduce bubbles i hope i will be okay. i am thinking on running a mag 18 i have a seio 1500 and a ehiem 2620 closed loop cannister filter i hope this is going to be enough but i can always add another power head. what do you think???
i just did the calculations and it is roughly 4300gph