Its a little more indepth then that. If you just pull it out and do nothing else you will wind up having the samething come back. How long has your aquarium been set up? how much LR do you have? Do you have any part of a 'Cleaning Crew' (Shrimp, crabs, snails, starfish, urchins, etc...)? And finally what kind of lights and how long do you leave them on? If you search this question in the archives there are undoubtly answers if you can keep these parameters in mind.