Checking on My year old 75g as per normal. Looking at the glass and i see this thing on my glass. I’ve been pretty good with not having nasty hitchhikers in my tank. At first i thought it was some sort of flatworm. However, when i went in to remove it the exterior was hard and when i pulled it off there was a smaller version underneath it. Anyone know what this thing is? It had a small mouth and two little antenna. and when i flipped it over there is a fleshy underside that it uses to hold only the glass.