noob just beginning questions

[intarsiabox]

Also when choosing a return pump also consider future use. You may want to tee off it to feed a refugium or run some GFO/Carbon canisters. If you get one with more capacity than you need at first you can just put a ball valve on the discharge to get the flow you want. There are also variable speed DC pumps that are at a reasonable price these days but I have never used one so I can't comment.