Also you mentioned starting a refugium with macro algae. I currently am running one. I did just what you said and used an ATO container and put a bulkhead in it and put the return into my sump. It's been working out great, however I've read that ZEOvit tanks nutrients are too low to support macro algae so I'm going to take my chaeto out, but keep the refugium with rock in it for pods to reproduce.