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I would recommend you get a tds meter. Is it possible your tds has been slowly climbing over months via evaporation? Sent from my Nexus 7 using Tapatalk

Well water is generally very hard, as evidenced in the GH reading. It is abundant with minerals leeched from the earth. GH test kits generally detect Calcium and Magnesium, but it also detects other minerals that contribute to hardness. Unfortunately, GH test kits do not distinguish between minerals. There might be something in the water that the shrimps are not agreeing with long term. It isn't lethal and cause deaths immediately, but over a longer term exposure, it might be an issue. Do you get reports back for the well water tests?

That's right ^^^ If GH reading is at 12, TDS is going to be high too. That Nitrate reading of 20 will also contribute to TDS. A TDS meter can be bought for cheap nowadays. It will confirm another water parameter. But you still need to do something about lowering the GH, and TDS. @Linda, Do you collect rain water?

See if any one selling second hand chiller in ur area. Might be worth it in the long run Sent from my HUAWEI Y360-U72 using Tapatalk