If you're going with a herbie/beananimal return that needs to be tuned i would defintily go with the seperate pumps. As my carbon prefilter gets plugged up i have more water going to the tank, causing my emergancy drain to get louder and louder. 1500-1800gph seems to be what most run for a return on tanks about that size. If you are running an sump skimmer, you should be moving more water past your skimmer than it takes in, otherwise you are double skimming your water.
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