"Ring of death" isn't guaranteed a death... it could be pre-molt.
What is the GH and KH of the tank?
I see a lot of protein foods but I don't see any vegetable or algae based foods. At minimum, I would recommend severely cutting back on the protein foods (as in, only feed once a week!) and provide a vegetable or algae based diet two times a week. Please be sure to read the ingredients! Many "algae" foods don't actually have algae in them until the 5th to 9th ingredient! You want that to be the primary ingredient.
If you have a heater, you could either turn it off or take it out.
If you aren't actively seeing deaths due to failed molts, it might not be that big of an issue.