Planted Tank Guru
Join Date: Dec 2012
Location: Hot Springs Ar. 71901
I'd need to get a much closer look at it, but just from this picture it looks like
bio-film to me.
Till proven wrong, I wouldn't want it on the front glass of my tank(s) but I
believe it to be beneficial and I just ignore it other places in the tank(s).
The shortest distance between any two points is a straight line...in the opposite direction...