They have scales. Dose the 3 tsp per g for ur tank size. So if it’s 100g then 300 tsp or 6 cups (rough estimate). Add 1/2 now and then the other half in 8 hours.
Make sure u do water changes and gravel vacuuming. If ur do a 50% water change for a 100g tank. Then add back the salt removed for 50g. 3 tsp per g for the 50g is 150 tsp or 3 cups.
Hope that clears it up. Follow the directions. Keep like this with temps at 86 for over 10 days. Week after last spot gone and should recover. Add a pump or Wavemaker to increase oxygen in the water.
