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What do you mean? It's still not dissolving?

Don't know if Biomax leeches carbonates. But only one way to know ... test it in RO water and see if it increases KH.

I use Fluval Flourite, which should be inert but should have some cation exchange capability. I use a sponge filter but it's a design that has a small filter media chamber. I filled it with Fluval biomax which I use in my other tank with a canister filter. I found another dying shrimp this morning. Seemed like a young adult male, might have been a failed molt but I can't tell for sure. I take it that KH reduction won't necessary see immediate effect since the shrimp have already developed their current shell? This would be something that takes time to fix for the shrimp? Aside from the fertilizer, the only other thing I can think of is a contaminant got into the tank. I would think that affects all the shrimp and not seemingly select individuals.