I actually have three refugia (four if you count the frag tank) across my system, all serving different purposes. First is a 40 gallon space in the main sump solely for chaeto, though bristleworms, small brittle stars and various pods always show up. Second is a 120 gallon tank setup as a refuge for those fish and inverts that struggle in the main display. It's setup a a reef tank, essentially. Third is a RDSB/cryptic tank with fine sand and some rubble. Pods of all kinds, mini and micro stars, spaghetti and bristleworms, sponges, mysis shrimp ....



