Personally I wouldn't worry much about tds with cherry shrimp.
Many people swear by tds readings for keeping crystal reds or taiwan bees, anything that is a bit more sensitive. Some people are quite successful without ever having a tds meter. A lot depends on your water, your ph, gh, and kh. If these things are not in line tds doesn't really matter (though it is related).
Tds is a great tool, and helps you get an idea of how your water is. The problem with tds is it doesn't tell you WHAT solids are in the water. This means your tds measurement can be perfect, but your shrimp will die if those solids aren't the right ones. This is why many people use ro water with something like salty shrimp, so they know exactly what the tds consists of.
Your tds is likely too high for crystals if that is your tap water. In fact you might want to look into a water softening system for your tap lol.
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