I have a 29g biocube as well, I had a baby blue hippo for about 3 weeks and then got rid of him because he was getting big, he was an awesome fish but i just felt guilty for having him in such a small tang, he was also being agressive with my six line. I like the way you have your rock setup, i have a hard time trying to find rocks that would be good in my tank. As for you lighting goes, i have the atcinic blue light and i just purchased a 50/50 light that i replaced for my 10,000 K light and it makes my tank look alot better.