In case you didn't read about my adventure...I've recently set up an Eco System Pro 40 on the back of my 20g. I've got a wad of chaeto in it and am noticing some detritus buildup. As time goes on, I know I'll get more pods in there, but I've seen others with snails, etc. in their refugiums. I've even read about clams from the store (littleneck) in the fuge. Don't know if there's anything in particular that will keep it tidy in there or do I have to clean some out occasionally. Any input would be appreciated!