spikes on astrea snails

clownfish cj

Reefing newb
my astrea snails are getting spikes on their shells and I do not know why, also a couple of them are growing their shells but it looks unbalanced, like the growth is not even.

Anybody know why? and is this good or bad?
 
here is a pic of the snails, it doesn't look anything like those stary astreas
 

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