HI:
First off i would skip over all the larger lions like volitans, antennatas, and radiatas, an think solely on the dwarf species, the larger lions get big, and will eat almost all of your reef fish. As mentioned above lions will eat ANYthing they can fit into their mouths, so say good bye to shrimp, some crabs, and small fish. W/ that said also recall that lions are meat eaters, and will certainly contribute their fare share of pollution to your tank. Also lions tend to be reclusive (and nocturnal), and may hide in the rockwork quite a bit (or at least til hungry). Now I have seen a successful reef tanks w/ dwarf fuzzy lions in it, and in fact if you only want corals, and hermit crabs, and one or two larger fish the lions should do fine. So its your call...but personally I would skip the lions...the first time your cleaning your tank, and you grab the lion by mistake (cuz its hiding in the rocks-you'll wish you left the lionout
my opinion
frank