flowrate

Hi there I recently got an old red sea max s 400 for free and am turning it into a new home for my dwarf lionfish and eel. its currently cycling and im wondering if theres anyway to turn down the main pump so that its not as aggressive for the lionfish since they are bad swimmer, if anyone...

Sitting here wide awake crunching numbers, flowrates, and head loss! 29dt 20sump What flowrate do I want going through sump? My flow rate in the dt is over 10x. I’m talking about the flowrate going through the sump to facilitate the best filtration? I’m thinking 29g times 5= 145gph? Or 29dt...