to be honest I've been pretty lazy with my fuge. I don't turn the cheato at all, and I only trim it once it grows over the water line, or grows into the return chamber. Theres really nothing wrong with this method (since I haven't had any problems, and it still grows VERY fast), but I have noticed that the chaeto at the top of the tank (in particular...the part that begins to stick out of the water) turns white. Turning it could help to prevent this from happening, but I dont think that its a huge deal since I just trim away the white strands.