hello i just got a 30 gallon reef aquarium and wanted to know if this brown algae like substance in normal iv been doing some research and it appears to me that this is cyanobacteria. Iv had the tank for about 1 week and 2 days. I have live rock live sand also been adding bacteria to the tank even though i have heard its useless but since i got it why not use it also have one greenstar polyp coral and a zoanthrope coral and they seem to be doing great for lighting i have an a can 600 and giveing the tank about 12 hours a day with light with a complete night cycle. I just wnat to know of this is a normal stage in my tank or what i should do to prevent any more mistakes i know i moved pretty fast can anyone help please.