I beleive you are asking how to clean the alge off of the fake corals. If that is what you are asking, soak the fake corals in a vinigar and water solution overnight, This will cut threw and loosen alot of the alge build up, even the coral line alge. and then take a soft toothbrush and scrub it clean, rinse very well before putting them back in your tank. Vinigar is about the only cleaning agent that is reef safe.