Hydroid?

Ok their are some pics

 

Appies.

 

Yeah, those are lil aiptasia. Peppermint shrimp army time.

 

Is it normal that they are only out when lights are off? or do they just do that in their early stages of growth?

 

My tank is a 35 gallon Hex with about 40lbs of live rock, i would say on estimate i see about 30-40 of these on my rock. How many pep shrimp do you think i would need to take care of the problem? 3-4?

 

IMO could be small aiptasia - they sometimes come out fully at night - but will come out during the day.
Are you sure it's not a feather duster?

 

I originally thought they were feather dusters but they are shaped more like aptasia then a feather duster. It's hard to get a good pic because they are so small and they disappear so quickly.

 

Of course both of the Lfs are out of peppermint shrimp...lol