oh... i wouldn't know... mine's in my 30. and if i ever need to take him out, i just lift the rock that he stays hanging upside down from.
well why don't you go buy another cbs, take the sexy out and put it in a fuge or somethin, put the new cbs in your smaller tank with flats, then when they're all eaten toss the cbs in your 150, and the sexy back in the smaller tank?