New and need help

[2pawsreefer]

Looking at the glass of my 30g nano reef saw these new micro creatures with eight legs should i be worried?

 

[2pawsreefer]

Also those appear to be copepods next to it if im correct the spider looking creatures are very small i feel i must say because the pic makes them look bigger then they are

 

[Crabs McJones]

Welcome to R2R!
Hydroids. Common in new tanks. Tend to die off on their own

 

[2pawsreefer]

Thank you!