Hydrozoan polyps developing in reef tank

[RedFrog211]

While looking at my tank, I noticed tiny white polyps under the live rock. No doubt they’re hydrozoans, probably mature forms of the “hydroids” I see occasionally on my glass. My purpose for posting is- do these pose any threat to my corals or inverts? I know they’re cnidarians as well, so they will sting. Do you think these will infest, or will they die off? Many people told me hydroids will go away as a tank matures. I tried to take a picture, but until my macro-lenses arrive, it’s no use. I’ll attach a photo from Google that best depicts them

 

[vetteguy53081]

The key to rid of them is to starve them. They favor brine shrimp. Direct flow towards them, not at them to prevent any food from reaching them