I have a BTA about 3 inches in diameter. I feed it Krill and was wondering how much I should feed it. I feed 2 x per week. I also have stock lighting on the 29 biocube and noticed that it is getting bleached looking. I had it higher in the tank for brighter light, but it moved midway down on the rocks in a crevice. Its been there for several months. What should I do?