I have a 12g nano tank with a 100g protien skimmer. The tank lid raised 1.5 inches to accomdate to skimmer. 12 lbs of LR and 1 peppermint shrimp 6 smalls and a sea urchin and I want a clown and an anemones. what can I keep in there? I am thinking of taking back my sea urchin to the LFS he is getting big very fast. Any help would be cool.