Whats on my astrea?

[dippin61]

So i saw these things on one of my astreas.. what are they? good or bad.. thinking bad since it doesnt come off the astrea.. dont seem to move, nor affect the astrea though.. so im not sure. pulled one off to see if it would come off, and it does.. so any help would be appreciated.

 

[greenbean36191]

The pictures are a bit small to tell, but they look like slipper limpets. They're harmless.

 

[dippin61]

click the pics to get the bigger ones

 

[dippin61]

i did some research on the slipper limpets.. the only difference i see on what i have is that they dont really have a hard shell like that i dont think.. ill have to pull another off and look closer..

thanks bean