Help ID critters

[The Spartan]

Can anyone ID this for me and if they are good or bad? New to reef tanks 8 months in. And yes I dipped all corals before putting them in. Thanks for the help!!

 

[homer1475]

I see in order from top, a feather duster(good guy, filter feeder), pinapple sponge(another good guy, although can be invasive), Hard to tell on the shroom, but looks to be more sponge. Last pic I cannot tell, but could be vermetid snail.

Other then the last, they are all ok to have, and shouldn't bother anything. The sponge may even die off on it's own.

 

[The Spartan]

I see in order from top, a feather duster(good guy, filter feeder), pinapple sponge(another good guy, although can be invasive), Hard to tell on the shroom, but looks to be more sponge. Last pic I cannot tell, but could be vermetid snail.

Other then the last, they are all ok to have, and shouldn't bother anything. The sponge may even die off on it's on

Thanks

 

[vetteguy53081]

Top is tube worm or hydroid Tube worms emit fans to capture food which is what it appears to be

Agree on Pineapple sponge which are found in darker areas and are short lived thriving from silicates found either in tap water or expired di resin

Bottom- Ball sponge which can be invasive. Expose it to air to stop iin its tracks or inject with air or vinegar