One drop equals 1 degree of hardness or 17.8ppm. A reading of 1400 equals 78 drop. I doubt that. I don't know of any fish that would survive in 1400 ppm water. how many drops did you add.? Use your test kit to measure the tap water hardness. How many drop do you have to add to tap water to get a color change? Look up your water utility water quality report. What is the GH number listed in the report?
GSA is sometimes caused by low phosphate levels. Get a phosphate test kit and determine what your phosphate levels are.