Brown stuff in gravel area !!
Hi, I have a 3.5 months old planted nano tank (with anubias nana, moss balls and frogbit). about a month or two ago, I noticed some reddish brown stuff surrounding the gravels (visible between the gravel layer and glass). Recently it has grown significantly. It's not there on the top of the gravels or anywhere above the gravels; not on the decorations or on the glass above the gravels.. probably because there are two nerite zebra snails. I do not know if this is present only between the glass and the gravels or within the gravel layer too. Is this brown algae? If so, could anyone suggest what to do?
I am new to aquariums/planted tanks. Any help is appreciated. Thanks