Meredith
Aquarium Advice Addict
I am not positive that is what it is, but its brown. The tube is clear, and I can see the water moving up the tube because the brown stuff is long-ish. Its hard to describe. Any way, my question is, would it be safe to take this tube off and let the ottos and the pleco eat the stuff inside? If it is algae they would love it right? I took a picture.