Help, horses still dying


So, the mate of the one that initially died, died after about 4 days of not eating. Then a pony that had seemed completely recovered (was eating, moving normally, etc) died.

I no longer think salinity is the culprit. I am very familiar with the LFS  procedures and testing and additionally we calculated that their water would have had to have been extremely high in order to move my tank’s parameters so dramatically. Others would have noticed – the employees used that very same water in their personal tanks. I think my refractometer was not calibrated correctly. 

I have done a number of 5 gallon water changes using different equipment , changed the carbon and purigen.  The fish are okay, the shrimp and urchin are okay.  I think the meet-eating snails have died, but in general the snails and hermits seem fine. Water parameters are fine. 

Do you have any ideas at all? Is it possible that some sort of containment is only hurting the seahorses?

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