Snail lethargy/die off reason?

[JCareyETexas]

Mixed reef tank up and running 2.5+ years.
Nitrite: 0
Nitrate: 0
pH: 8.0
Ammonia: 0
Salinity: ? (hydrometer took a dive)
I do ~20% water changes biweekly (store brewed saltwater, my ro system is down)
Conch is doing great, nassarius snails doing great, Mexican Baja and margarita snails don't fare so well.
Looking for ideas as to why.
Go.

[JCareyETexas]

Probably worth noting.... I have not really had a "die off" of my snails but a couple of the specimens are staying in one spot on the glass going on 2+ days now. One of the stationary snails has been assassinated, his shell commandeered by my lone hermit crab whom is about to be banished to the sump in his new shell.

[rlm2005]

Temperature? Those are cooler water snails and we typically keep our tanks at warmer temps.

[JCareyETexas]

Originally Posted by rlm2005

Temperature? Those are cooler water snails and we typically keep our tanks at warmer temps.

Had not thought about temp. Will monitor the temp swings and see what they are doing.

[RA]

Sounds like it's time to buy a refractometer. You need to know what your salinity is!

[JCareyETexas]

Originally Posted by RA

Sounds like it's time to buy a refractometer. You need to know what your salinity is!

Yes, this is apparent. Any ideas as to the snails though? Are they more afflicted by salinity than any of the other inverts in my tank (lps, softies, shrooms, polyps, shrimp)?

[RA]

Originally Posted by JCareyETexas

Yes, this is apparent. Any ideas as to the snails though? Are they more afflicted by salinity than any of the other inverts in my tank (lps, softies, shrooms, polyps, shrimp)?

Yes they are.

[rlm2005]

Originally Posted by JCareyETexas

Yes, this is apparent. Any ideas as to the snails though? Are they more afflicted by salinity than any of the other inverts in my tank (lps, softies, shrooms, polyps, shrimp)?

But you have a conch and nassarius snails which are fine. The ones that aren't are the cooler water snails. You do need a refractometer and you should know the exact salinity, but I think the problem is that those snails were not suited to the tank.

[FuGu2]

what is your phosphate level? It might be coincidence, but all my snails started to become lathargic and then died. Found out my phosphates spiked.

[fletch999]

my turbo snails are lethargic with high MG

[JCareyETexas]

Originally Posted by FuGu2

what is your phosphate level? It might be coincidence, but all my snails started to become lathargic and then died. Found out my phosphates spiked.

I am going to check this. I admittedly haven't checked phosphate in some time as it has not been an issue since I incorporated bioplastics and macroalgae into my system.
Furthermore, I may have cried wolf.... upon further observation it is in fact only two snails (one of which got too close to my hermit crab and was taken out) that were acting lethargic and I'm guessing were two that were in a lot that was recently added to the tank. Perhaps some specimens are simply not cut out for tank life?