Nerite With Blue/Green Spot

Mattherrt
Member
Good evening!
A while ago, I got this nerite snail that is kinda olive and it has this weird, blue spot. It has had it since the beginning and has acted healthy, so I am not really concerned, just curious. I have attached an image. What do you think it is?
 
Kribensis27
Member
Looks like a bit of shell erosion. It's perfectly normal, and often appears after being exposed to soft water for a while. It sometimes takes on a green or blue color, I'm guessing that's just an inner layer of the shell. Additionally, sometimes a small amount of harmless(ish) cyanobacteria will grow on these patches, giving them this color, but never seem to spread.
 
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Mattherrt
Member
Thank you for the information! That’s really cool.
 

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