White spots on glass surface

[kwan]

Ever since I have moved my fishes to [acronym:0c9bd2b2f0="quarantine or quart depending on context"]QT[/acronym:0c9bd2b2f0] a couple weeks ago, my main tank [acronym:0c9bd2b2f0="Fish only with live rock"]FOWLR[/acronym:0c9bd2b2f0] have been left to fallow. It still has two cleaner shrimps, a blood shrimp, a dozen of turbo snails and red leg hermit crabs.

Today I have noticed some white grain sized crusts on my main tank glass surface. Some are bigger than other and I have to use my nails to scrap them off. It looks like whitespots from the fishes. Does anyone know what it might be? Could it be whitespots?

I also notice one of my cleaner shrimp last night was pretty ichy. He was scratching himself by curing his tail right round. I thought whitespots does not affect inverts. Am I still correct to leave my main tank to fallow for 4 to 6 weeks with the inverts in there and the whitespots disease should die away? The inverts shouldn't be hosts to whitespots, right?

[Gauge]

I've never heard of a disease attaching to glass. The only sources of white spots on the glass that I've ever witnessed are:

1) Eggs of some kind (I've only seen snail eggs)
2) Small sessile invertibrates (I have some and they sort of resemble barnacles)

The only way I could really tell the difference (since I have bad eyesight) when they're really small is the pattern they're in. Eggs are clustered, where the latter are usually randomly scattered.

[douggiestyle]

i have some very light colored coraline growing on my glass

[douggiestyle]

hold on i found some white spots on my glass also. small white spots. tried using tweezers and all it did was break the shell. on close inspection they are some type of calcareous tube worm . and i could see some movement in and out of the tube. looks as if the shell is forming a flat spiral. very small. eyes are too old. need a good tele-maro lens. i would go with "small sessile invert" as gauge suggested. cant wait to show the wife. its a party nite

[kwan]

So, I assume is a good thing, right? Now that I have removed all the ones from the front, I shall give it a closer look around the back and sides. Cheers!

They are spirorbid worms. Harmless filter feeders.

Cheers
Steve