[Solved] GH with Supershrimp salt and distilled water off the charts high

[darkextratoasty]

GH doesn't apply to brackish water at all, so this is exactly what is expected. As a side note, it is ridiculously difficult to find information on brackish water aquariums!

Original question in case someone stumbles across this in the future:
I know the supershrimp salt page says no water testing needed, but I bought an API GH&KH test kit to make sure the coral I added doesn't increase the KH too much. When I tested my tank, which has been sitting growing algae for about a month, the KH was fine, around 5°dKH or 90ppm, but the GH was so high the test kit couldn't read it. I initially mixed a 2.5 gallon portion of brackish water and not all of it fit in the tank, so I have a bottle of it sitting beside the tank. I measured that, which should be exactly what the supershrimp salt makes without the effects of sitting for a while with coral in it, and it was still too high to measure, so it wasn't my tank adding hardness. I diluted the brackish water 4:1 distilled water to supershrimp salt brackish, and still couldn't read it with the tester, it simply never turned green even after 40 drops. I did try the tester in distilled water and it worked just fine, so I don't think I have a bad test kit.

I've read that the API freshwater GH&KH test kit can be used in fresh and brackish water, but maybe that's not true? Or is a wildly high GH expected with the supershrimp salt mixture and is ok for Opae Ula shrimp? I thought that having GH too high can cause moulting problems.