not sure i prolly should have taken a pic.. i have this rock in my 30 gallon with like 12 mushrooms or so and i caught the crab eating them and like 2 are gone now 
but i picked up the rock he was on and scooped him up with the net *thumbsups i threw him in my 125 gallon wich i prolly shouldnt have but ohwell now at least hes outa my reef tank
but i picked up the rock he was on and scooped him up with the net *thumbsups i threw him in my 125 gallon wich i prolly shouldnt have but ohwell now at least hes outa my reef tank