I was very nervous dosing my discus tank at 1tbsp/1gal but they handled it without issue. They were tank raised also, but I know folks over on the Simply Discus website that use this dosing with wild discus from 0 TDS native waters.
To be careful you could bring it up to concentration over a 24 hour period and keep watch as you add each subsequent dose
To be careful you could bring it up to concentration over a 24 hour period and keep watch as you add each subsequent dose