Small white circles appearing on glass

[PotatoPig]

So I’ve been noticing some small white circles appearing on the tank glass - none at the front or ends, just at the back, and now one in the sump. I though they might be some sort of mineral deposits but from the one in the sump now I’m not sure - is this a limpet/barnacle of some description?

They’re about 1/16” to 1/8” across, have maybe 8-10 of them in various locations, have not noticed them shifting locations.

Photo is looking through the glass. Apologies for poor quality - using phone and testing the limits of its auto focus and zoom…

 

[AydenLincoln]

Possibly spirorbis or tube worms! Both harmless.

 

[PotatoPig]

Possibly spirorbis or tube worms! Both harmless.

*google* hmmm. Both look possible at this stage.

It’s amazing how much hitch hikes in on so little.

Tank started from dry rock and fish. No live rock added. The only things I’ve intentionally added apart from fish are a three hermit crabs, two astraea snails and two bumble bee snails.

So far I’ve seen:

Mystery little worms on glass. Put one under the microscope and 70% sure they’re dorvilleidae worms.

Mystery pods. Small - similar to Tisbe.

Bristleworm in discarded hermit crab shell.

Aiptasia (small) on the same discarded hermit crab shell. (Fished it out with the worm also - haven’t seen either since).

And now these things.

 

[EeyoreIsMySpiritAnimal]

So I’ve been noticing some small white circles appearing on the tank glass - none at the front or ends, just at the back, and now one in the sump. I though they might be some sort of mineral deposits but from the one in the sump now I’m not sure - is this a limpet/barnacle of some description?

They’re about 1/16” to 1/8” across, have maybe 8-10 of them in various locations, have not noticed them shifting locations.

Photo is looking through the glass. Apologies for poor quality - using phone and testing the limits of its auto focus and zoom…

What is that!! A R2R guide to common new tank hitchhikers.

One of the greatest things about starting a reef tank is getting your live rock in and admiring all the diversity within it. The rock comes to life different creatures. This is a guide that I, along with a very well known critter identifier @KJ , have put together for the new reefer on what...

www.reef2reef.com

 

[hmfaysal]

My bet is on spirorbid worms. These are filter feeders and generally increase in population when there is excess food in the water column. Although these are harmless, they are a pretty good indicator whether you are feeding excess. Feed a little less from now on, and they disappear.