White crap on my astreas

Is this normal? I woke up this morning to find my astrea snails (all 3 of them) looking different. Their shells look like they're covered with a white chalky substance. I tried rubbing one of them with a wooden spoon and I couldn't seem to scrape any off.

There are also white circular specks of what appears to be the same gunk on the sides of the aquarium, just a few of them.

My hermit crab and clarkii clown seem unaffected. Everything else seems normal....

 

Probably snail eggs.

 

hmmm i have some of that i think...they r like really little barnicles or somthing like that...they have a little crown than comes in and out...to my knowing they r ok

 

well, what you got are corals. They are all over my rock. real pretty actually

 

Actually I believe the white cicular things on your glass are Tube Worms. They will cause no harm and are acctually a sign of a healthy reef system. As far as your snail I'm not sure. A pic goes a long ways

 

I'm not sure if they are tube worms. Do they come out for a long time and disappear when something comes close? then they are ...
But I have those things, that stick out their "heads" hundrets of times a day, like pulsing.

 

Yeah I shoulda done pics the first time

These two shots show the snails covered in the white crap. Just yesterday they were totally that magenta color that you can still see on the one snail. Today--poof! White.





Here's an attempted shot of some white spots on the back of the tank (and my fish incidentally in the shot)

 

ok, then we had it all wrong...
I don't know, I would say that the coraline algea died off, but since you got white spots on the glass, that can't be it. Maybe calcium settling down? I don't know

 

I agree with hoodoo, this looks like coraline algae die off. Not a huge suprise if these were recent additions. As far as the spots on the glass they look like tube worms. no worries