Large tank, large refugium. While a large system with the standard set up will work a refugium that drains into the display would work best. Before I left the hobby I had mandarin, scooter blennies and wrasses in my two reef tanks that were on the same sump system. I had a large display fuge 75g and an overhead fuge on both display tanks. The fuges were absolutely crawling with pods but you would never see any on the glass of the displays. All the obligate pod eaters were fat and happy though.How do you keep the pod population up? I've never had good success, I used to breed and feed every other week, but my mandarins always kicked the bucket