What size overflow box?


Reefing newb
How do u determine which size overflow box u need and what size return pump for the sump? Im setting up a 55g? Sorry for all the questions lately :)
You need to buy a pump rated slightly higher than 300 gph because the pump will be pushing up against gravity, so it loses its strength.
Yes, and in case of a power outage, it will automatically restart the siphon. I believe that the CPR overflow boxes are the only ones that use that; the other brands start automatically (which is a plus).