I had a biocube 29. I loved it, but it didn't come with a skimmer, so I added one with a media basket that had chaeto, purigen, and filter floss as a mini fuge. Under stock lighting, I had zoanthids, a RBTA, mushrooms, carribean rose corals, a jewelbox clam, a flexible finger leather, and a ricordea that were all healthy and thriving. As far as a CUC, I had a sand sifting star (I STRONGLY recommend you do not get one, I only got him for my upgrade to a 110), about 10-15 nass snails, 3 mexican turbos, 10-20 blue leg hermits, an emerald crab, 5 margarita snails, and 10-15 astrea/turbo snails. Plus a porcelain, a decorator, a gorilla, and a red mithrax crab that all came with the LR. And my fish were 2 clowns, a valentini puffer, and a mandarin. If you do something similar, I think you could set up a great tank. Just stick with NPS and low light corals with the stock lights, and don't get any clams like maximas unless you upgrade the lights. Also, I highly recommend using live sand, live rock, and live water. I did all 3 and didn't need to cycle either time I did it (the 29 and a 110 gallon) and never had any water chemistry issues.