Stop thinking, start doing!
Jokes aside, refugiums are great. If you have marco algae in there they provide extra nutriet export reducing levels of nitrate and phosphates (which is what you want to do since you are obviously having problems considering your algae problem, just remember to remove some algae off the glass or rocks so there is some in the water for your marco algae to absorb because at the moment its likely that it is all being used by the algae you have in your tank) and it gives critters like pods
and other good things to grow and live in a predator fre environment.
On the actual plumbing, I have no idea! Sorry. I'm a critter and some tech stuff guy.