I had a LOT of stuff in there. Mostly zoas though. they cover all the rocks very well. I had palythoa, green star polyps, and mushrooms too for soft coral. For LPS i had blastomussa and an acan. For SPS i had montiporas, green birdsnest, millepora, and pocillopora. you will be surprised how much life a 3 gal can support. I had some crazy water turnover though. there was an Aquaclear 70 running on that 3 gal plus the K-nano powerhead.