i know it would be better if i had a pic but i couldn't get one and now he is in hidding again... but it was about 2inchs around and on the glass he looked like one of those really big snails but when i went to see the top side i could see there was no shell and was kinda pink or peach colored, he moved pretty fast and i have not added anything to my tank for about 9m and never seen it before but i do have a large tank with alot of rock but this thing is sooooo big you would think it would be hard to miss.... any ideas so i can google it would be great.. would like to leave him in there if hes ok but if hes not then the next time i see him i will have to get him out.