Hi I used reverse osmosis to setup my brackish aquarium so I needed to increase the GH by adding a product to re mineralise the water, I purchased a API GH tester but it didnât change no matter how many drops I used then someone said the GH tester doesnât work with saltwater, is this true ? I have looked and canât find any product to measure GH in saltwater so I thought try TDS meters but a lot of people say they measure everything in the water so wonât give a real GH reading, so I have no clue how Iâm going to monitor the aquariums GH, Any advise how I can test the brackish water GH?