Kolossus, sorry to hear about your past losses. I guess besides a good Q schedule - to also never let neighbors or others that are unknowing about the hobby take care of your rays!
I'm sure Kolossus usually takes good care of them. I think it would have been better if she didn't feed at all, as rays with some nice fat reserves can hold off on eating for a while.
i have had both sand and barebottom in my tank.
however, i never find any problem with the rays regarding the sand or the glass panel?
the only reason why i now keep them in a bare bottom tank is because the rays are getting so large when they swim they kick up all the sand into my external filter, if that wasn't the problem i would still be using sand.
It'd be interesting to see if the type of substrate plays into it at all, especially with the discussion of silica sand lately.
I didn't answer the poll because I've only had my rays since October, but so far so good. I also didn't quarantine, which I regret, but everything seems ok thus far. Poo seems to be ok concerning all the fish in the tank as I've been keeping a close eye on them.
I've been using 3M ColorQuartz... all I have to say is that it is an awesome product. Too bad it is being discontinued this Dec. Going to pick up 2-3 more bags and keep them in storage.