Found Somthing New

[SW_freak]

I was observing the tank tonight after an addition of red mushrooms and seen this lamprey looking thing. Dont know how long it was because it was in the rock and only had some coming out. Had tenticles around the mouth maybe 8 with no visible eyes. the mouth would extend out of the body and open then suck back in. It was white with brown banding and as big around as this "o" can anyone help me? Once again i cant get a pic because it is hidden in the rock and my camera wont focus in on it.