Do you guys know what this is?

[ianw163]

Lately I have seen these white hard things on my glass and it spreads really quickly. Do anyone know what this is? also if anyone knows what it is, is it harmful to my tank or not and how to get rid of it.

 

[Stephen Glover]

If it’s the white dots then they are spirobid worms. Harmless filtering feeders, no need to remove them unless you really want to.

 

[Nman]

New tanks get a lot of this . Does no harm just scrape it off the glass . I’ve had it in all my new set ups

 

[Tired]

Spirobids, yeah. They go a little nuts in new tanks, then die down to a more reasonable level. Scrape off any you don't want, and ignore any you don't care about- algae and coral will grow right over them.

 

[blecki]

I ruined a nice acrylic tank by running an algae scrubber over these. They come lose, get trapped under the scrubber, and scratch the acrylic. Be careful if you scrape them off.

 

[Dburr1014]

You should see my overflow.

 

[ianw163]

If it’s the white dots then they are spirobid worms. Harmless filtering feeders, no need to remove them unless you really want to.

Thanks

 

[ianw163]

Thanks for all of your help!