i know those brown protopalys certainly love the glass, at least they do in my tank. i just stuck them in tthe corner and they grew up the glass. i did that same thing to a snail once but the polyps all died, the snail also used to do that shell flick thing they do constnatly. i think it knew there was something stuck on him and it ****ed him off.
edit: cant say ****?? that is horrible. what are we? puritans??