I have some algae growing on my rocks in my tank. It looks brown but the library said brown algae grows on glass. So I am not sure. My gobies dont eat it so I presume it is brown algae. Also, will a BN pleco eat the kind?
Bristlenose will eat a lot of different kinds of algae. What you are describing sounds like diatoms. Here is some info on diatoms.
Diatom Algae typically is brown in appearance and usually is seen within the first 4-16 weeks following the install of an aquarium. Diatom algae have three basic needs to thrive: silicate as a food source, a low pH in a saltwater environment, and light in the yellow, orange, and red spectrum. During the first few weeks after an aquarium is set-up diatom algae growth can be very aggressive. It may cover the glass in as little as 48 hours. Diatom algae growth is normal and the direct result from the tremendous amount silica found in the synthetic salt used to make saltwater. Most synthetic sea salt manufacturers use silica, a moisture removing product, in the manufacture of synthetic salts. As the concentration of silica falls, the algae runs out of food, and slowly goes away.