I have a 12 gallon nano cube that has been setup for 2 weeks now. I have 5 blue hermit crabs and 2 damsels to help cycle the tank. My last test which were done last night read salinity 1.023 Ph 8.2 amonia .25 nitrites off the chart nitrates 40 ppm On sunday I noticed a little bit of this brown stuff but I wasn't too concerned, but last night after coming home from work I noticed my tank is covered with this stuff. What the heck is it and is bad for my tank, how to get rid of it it looks horrible. Sorry no pics any help would be great thanks guys.