back in the day (1995) I had one set up with (GULP) an Achilles tang, a firefish, an Argi angel and a Flameback angel. Had polyps growing in it, as well as feather caulerpa and and some live rock. Always had algae problems, but I kid you not, I had that Achilles for over 3 years, ... it moved to a 45 gal tank, then a 90 gal, so it was happy.