Saltwater Bugs?

[saltyvixen]

I've seen some little bugs crawling around and on the rocks. Not sure what they are and they move too fast to snap a picture. I guess they are brown. What could they be and are they harmful?

 

[ringo®]

Do they look like this?

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[saltyvixen]

also noticed colonial hydroids. Bad?

Edit:

Ringo®;882766 wrote: Do they look like this?

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no more like i teeny tiny rolly polly

Edit: i guess its an amphipod, it looks like this pic.

 

[ringo®]

I would think it's some type of copepod or amphipod.

I consider hyrdroids a pest. Good news is they're easily removable with air tubing

 

[saltyvixen]

Ringo®;882768 wrote: I would think it's some type of copepod or amphipod.

I consider hyrdroids a pest. Good news is they're easily removable with air tubing

how so? I have a growing cluster of them. They've been in my tank for some time. i thought they were feather dusters. But now i know.

 

[ringo®]

They're from the jellyfish family, so they can sting. The rate which they reproduce bothers me the most.