So, I am leaning towards a mix of pH crash and stress from me trying to feed too many different things, maybe something else coming back? He developed white spots over the weekend, which I believed to be disc burn from the drop in pH. He slowly got worse and worse and passed away over the weekend.
I am going to wait on rays again for now, I had kept fish for years before this and was really successful, but I had a run of bad luck over the last 6 months where nothing was going right for me. I am going to deep clean everything, get my 220 sealed back up and go back to regular fish for a while. Might visit rays again in the future, I just don't have the time currently, I underestimated the level of involvement with these guys.
Thanks for all your help, I hate that it ended this way but I also don't feel like I was given a fair chance to begin with, as I was having issues from day 1 with a malnourished wild caught pup.