Hey all, I’ve been working on setting up my 135 and I’m well into the process. I’m running two canister filters on the main 135 reef so I do not have a sump. I want to plumb a 15 gallon column tank into the main display, but I don’t want a HOB overflow or to drill the tank. My idea is to run a pump in line and put the input in the 135 and output in the 15 column. Then drill the 15gallon and run an overflow back into the 135. I want to have a macro algae display in the 15 gallon with a deep sand bed to help remove nitrates and phosphates. My question is basically about the plumbing. Any issues with my idea? Or any better suggestions?