800 is extremely high no matter what but Just for clarity TDS really doesn’t mean a thing unless you’re using RO/DI water that has been remineralized. If you’re using tap water the TDS could be any number of different salts. If you really want to know what’s going on with your tank you need a KH and GH test kit
Kipdu 
800 is extremely high no matter what but Just for clarity TDS really doesn’t mean a thing unless you’re using RO/DI water that has been remineralized. If you’re using tap water the TDS could be any number of different salts. If you really want to know what’s going on with your tank you need a KH and GH test kit
If you don’t have a lid and are topping off evaporated water with tap or mineralized water, you’re adding to the tds everytime you add water.
Definitely a main reason why shrimp are dying. Most shrimp cap out at 300ppm.
What is this tool you are using?