I think it is not only about temperature & TDS...
Please check your PH, GH...
CRS really need a low temperature.. Mine maintaining at 24-25deg.. PH6.2-6.3.. GH at 5-6.. TDS170..
How big is the tank? Minimum to be 60x30x30cm dimension to maintain not such a big fluctuation during water change.. By adding those stuff like mineral rocks, mineral ball and dosing Bacter max will not solve issues if you never cycle your tank well.. Just note all these or read the sticky in the invertebrate section again, or else just google..
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