Hello everyone. I set up a 55g. last week w/ 40 individual plants, two treatments of bio spira, 14 fish, a H.O.T. magnum, a bio wheel(only at night), 260 watt light(all 6700k), lots of driftwood and caves, 4 bags of eco complete on top of 1" fine gravel, the full flourish line, and a co2 fizz factory. Yesterday I noticed the tops of my caves were getting brownish. Today the brown has spread to my plants leaves(little spots), and the caves are covered. What should I do? How can it be cleaned from my plants? Thanks for any replies.