Life span of pyra snails

Chris Harbaugh

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I have 2 active tanks, 125g with 55g refugium. Cal-470, alk-9.0, mag-1380. Nitrate at 0.16ppm, phosphate at 0.08, salinity at 1.025. Temp at 79.8. Ph-8.3
A 30g with a 20g refugium. Cal-420, alk-10.1, mag-1360, nitrate-0.025, phosphate-0.06, salinity at 1.025, temp-80.4, ph-8.2.

I have one squamosa, one hippopus, one crocea in my 125g and one derasa, and one maxima in my 30g.

In both tanks,starting with the 30g I noticed some extremely small snails on my ceramic clam mount I have my maxima on. I did not realize they were snails until after watching the specks that they were moving. These snails are not the size of a grain of rice. They are much, much smaller. 0.25mm would be large for them to say the least. I personally believe they are smaller than that. Needless to say I crushed them with my finger. (I did try to pick one up but it was too small to pickup with my fingers) these little creatures are not white. The shells are a brownish green. They do move rather fast for there size. I then started to check all my clams and needless to say, they are in both my tanks. I will get pictures or a video tonight. I'm sure it is a parasite snail but what kind I don't know.

What is the life cycle of these parasites?? And how often can I clean my clams, picking them up and all, without killing them and stressing them out?
 
Good picture help ID this snails.
 
And to add to that if they do not have clams to feed on they are capable of and do feed off larger snails.
 
I just took a video of one. I'm looking for more. It's only 4:30 in the afternoon. I thought those parasites only came out at night??
 
20170429_170306.jpg
 
These are some still pictures. I wish I could upload the video. These things are super small. I have more pictures if needed..
 
Nope not pyramids that I am familiar with. The pyramids I am familiar with look like a grain of rice, completely white and smaller. Hopefully @Lionfish Lair will know.
 
Columbellidae?
 
Species of snails.
I just looked it up. Looks like a hit or miss but this type of species isn't a dedicated parasite. What I read they eat just about everything, including anemones.. I have never seen them on my rock. Just the sand.. I'll keep looking for more info but if Anybody knows where a reference is on how to identify and get more info about there dangers to my tank I would appreciate the info. Thanks
 
Here are 3 more picture I just now took. It's noon time so these snails are definitely not nocturnal. I'm not even sure they are even feeding on my clams. They are just a unknown which is a bit worrying.. I hope more responses come, because I sure would like a ID of this animal.
 

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