Oh no! Sorry to hear! I'm definitely not an expert, but with dwarf angels I feel like it's really hit or miss getting one that eats prepared foods in an aquarium. I had a multibar that never really ate anything or pecked around the rocks who didn't last very long. The next one I got happened to accept both dry and frozen food, which really just seems like it was a stroke of luck. The multibar I got after that doesn't seem to be eating any of the food I'm putting in but it is at least pecking around the rocks and sand so I think there's still hope.Well we are back to square one in the observation tank. When I came home from from work on Friday evening, the keyhole was laying on the sand barely breathing. I scooped him up and did the usual assessment for disease. I didn't find any but what I did find was a malnourished fish. Our best guess is that it had parasites or it never ate and that there is something in the tank unseen that was eating the food. We never physically watched any food being eaten, only disappearing from the sand bed. See pics below for skinny ness.
Tori, how many tanks do you have? It seems like you have an endless supply of QT space for new fish.
On the plus side, my birthday went swimmingly, literally!! Halfway through golfing, the sky opened up and I was wetter than the bottom of the ocean.
I have 2 other tanks ruining that I can put stuff in but I don't really QT much to be honest. I try to get pre-quarantined or aquarium conditioned fish as much as I can or I'll try to watch the fish at the lfs for a couple of weeks. This is after getting velvet and losing 26 out of 30 fish during my initial stocking attempt, so my version of being more careful. I also go with more of a parasite "management" system by running uv and dosing H2O2. There was at least one of the 4 remaining fish I was never getting out without tearing everything down so I tried this route. I think your route is definitely better though. For me I think a finicky dwarf angel will have a better chance in my established tank rather than with my subpar QT skills but if I pick up a random fish at the lfs without seeing it multiple weeks I'll put it in my qt tank, like the possum wrasse and hectors goby I added recently. I also treat with prazipro for flukes every 4 to 6 months just in case since the angels aren't being QTd and they're know to have flukes.
Happy birthday! Glad everything else went relatively well