Hello... I have a 29 biocube with apx 30lbs live sand, 25lbs live rock, then tank has been up and running for about 3 weeks, have been keeping up on Chem reg. all seems to be good there, there is 14 hermits, 2 peppermint shrimp, a frag of zoas and some blue Xenia in the tank now, the brown algae has almost comp overtaken everything, my white live sand is brown, even the crab shells!! What can I do to fix this?? I've read to cut back the light times, but with the zoas and Xenia I wasn't sure if less than 12 hrs a day was going to be enough light? This stuff is nasty and growing out of control!! Please help!!