SUMP DESIGN HELP please

[phi delt reefer]

what return pump are you using

are you running any reactors off the return pump?

what is the return pump gph rating after head loss?

i would recommend an eheim 1262 or ATB flowstar 1500 given your system volume - you can throttle them back with a gate valve if the flow is too much. Go with a Bean animal overflow system - this will require three holes for the overflow and two for the return. 1" should be good if you go with the bean animal - it allows for redundancy and is dead silent. 3/4" for the return should be good but if you check the pump specs it will tell you what the exit size fitting size is - if its one inch just use an adaptor to bring it down to 3/4 so you dont have giant return nozzles in your tank.