Copepod Bunker / HotelIf you have wrasse or mandarin fish, you really need to have a great supply of Copepods for your fish to eat. If you just dump a pod culture into your refugium, sure they may populate but they have to then make it through the sponge, the filter, the pump and back into the tank and settle in there. Chances are, your population will dwindle. Our nearly indestructible Copepod Bunkers are made from ABS plastic with corrugated plastic "rooms" for the pods