It's true that once they multiply, they can become problematic. They will spawn in your tank, making it look cloudy. Be ready to do a water change or if you have skimmer, get it cranking. I found the best way IME, is to have a wrasse e.g. (coris wrasse, sixline wrasse, radiant wrasse) they will keep the population down. Just remember most wrasses are jumpers so an enclosed canopy is must.