Rare death

[jpontier212]

I have a jbj nano cube 24 that has been set up for about a month now. My parameters are right on point but i had 1 red legged hermit, 2 atlantic white snails and 1 mexican turbo snails turn up death this morning. The only thing outta whack was the salinity was 1.028. I had an acan get discolored and a hammer coral all the way in its shell looking like a skeletor.
Parameters
Ammonia 0
Nitrite 0
Nitrate 10 ppm
salinity 1.028
PH 8.0
temp 79.6
phosphate 0.1
cal 380
mg 1300
KH 9 dkh
LIVESTOCK
2 Snowflake clownfish
5 blue legged hermits
2 jumbo mexican turbo
1 sand shifting starfish

 

[deerhunter06]

Contamination maybe, could of been the high SG but I doubt it, Also CUC have a way of evening themselves out there may not have been enough food. However with your corals being ticked as well it I would lean towards the first option have you dosed anything for any sicknesses or added anything extra at all?

 

[4FordFamily]

Contamination maybe, could of been the high SG but I doubt it, Also CUC have a way of evening themselves out there may not have been enough food. However with your corals being ticked as well it I would lean towards the first option have you dosed anything for any sicknesses or added anything extra at all?

X2 large water change is your best bet IMO