Hello so I have currently a filter cartridge setup for my 75 gallon reef tank. Yeah I know a filter cartridge isn’t ideal. I want to switch to a sump. BUT I have an idea on how to set up a sump (thinking of buying a tank and designing it myself). My only question is is there some sort of pump that of the power ***** off ***** off the section? If not all the water would drain out. Any ideas???????