ID please pest or not

[Ndmartin0120]

I have these all over rocks and powerheads don't know what they are. They are small white cylinder looking things that are fuzzy and have almost what looks like a feather duster head in them pic is hard to see.

 

[cosmo]

spirorbid worms! Can get kinda ugly, but mostly harmless. They'll usually bloom then mostly die off in a month or so.

 

[Ndmartin0120]

I googled those worms and that isn't what these are they aren't coiled looking these come straight off the rocks and look cylindrical with like fuzzy hairs and a fan head

 

[cosmo]

ahh sorry i was looking at the smaller things, those bigger things look like pineapple sponges, similar story, should come and go in a few months. The pics are fuzzy though, can ya get a better one?

 

[Ndmartin0120]

I've tried but they are small and the more I zoom the blurrier the pic. They do have a shape like a pineapple so makes sense. I bet there are 30 of them. Will they take over and what causes them to die off. My tank is 4 months old.

 

[Ndmartin0120]

Better pic maybe

 

[cosmo]

4 months seems to be about right for pineapple sponges, normally they seem to die off after a few months, but ya can always remove them if ya want. They're not really negative, just can get kinda ugly.

 

[Ndmartin0120]

Ok thanks for the info...they don't really bother me just curious and making sure I don't need to remove them. I was worried if I let them go they would take over tank i'll just see how they do. Thanks again.....