What is this on my glass ?

I know it is a little blurry and I have asked about this before but it is really bothering me and I need to know if this is bad stuff ?

It looks like tiny stars on my glass about 2mm in size. There are many of these in my glass.

Had this tank for about 2 months now.

 

hydroids. very common with new tanks

will go away when tank matures. but could also get outta hand. just keep up water quality and you will be fine

 

yeh, what he said...

 

I already have two tangs in there .. and a pair of clowns .. will they do harm to them ? I have seen the tangs scratching against rocks .. not sure if these things are on their bodies.

Where do these come from and how would they go away eventually ?

 

they wont harm any of your fish. but personally a tang should be in a more mature tank.(just my 2 cents)

anyway. the hydroids likely came from the live rock, and they are jellyfish hydroids, like a larval stage....i think. but if you keep the water prestine then they will not have the nutrients to keep them fed. so they die off.... i think. lol

i never really worried about them when i saw them. so neither should you

 

Great ... thanks for the feedbacks