Epson Salt for Arowana - Advice Needed

One of my red develop swimblader problem due overfeeding ., The fella was a greed eater and part of a red com . I hv isolate the fella in a Qtank and control it diet . He still swim Hele , so i was thinking add Epson salt to help with the SBP . Pls note the SBP problem was no due to infection but more of over feeding .

Anyone with Epson salt treatement and was is the recomended dose