I have a community freshwater aquarium. I use RO/DI water and add Kent RO Right for the trace elements freshwater fish need to have put back in. My RO/DI system has a dual inline TDS meter so I know my product water has a TDS of 0ppm. Is there a need for me to test the TDS of the water in the aquarium? The Kent RO Right bottle recommends a TDS of 160-220 for freshwater. Should I test the water in the aquarium so that I know how much RO Right to add (until I go from 0 to about 200)?