In my opinion, I think dGH is too high for CRS. With tap only, you'll end up even higher than that over time as you try to account for evaporation. I fear they'll not be able to fully escape their shell when molting 
For discus, while they do prefer softer water, they survive just fine in somewhat harder water like yours.
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For discus, while they do prefer softer water, they survive just fine in somewhat harder water like yours.
Sent from my Nexus 6 using Tapatalk