Take out the acro and peel it off, yes. You may have to repeat again in a week. After a couple times it should be gone. Also if you are careful you can scrub it with an old toothbrush but be sure you don't scrub the acro tissue. Also don't hold the acro with your fingers if you can help it and when you put it back into the tank blow it off a little by holding it in front of a powerhead for a few seconds and rotating it around.