The dartfish and the cardinal are doing well in hospital tank and have not shown any negative signs. They are more shy in a tank that's too small for them, so I'm looking forward to getting the cardinal back in the display tank. The dartfish are each 6-7", which was double the advertised size on Divers Den (< 4"). Due to this, I'm hoping to find them a home in a bigger tank with someone else in the club. There's a for sale thread if you're interested here:
http://bareefers.org/forum/threads/zebra-barred-dartfish-trio-divers-den-50-obo.17921/
The display tank is doing great. Water parameters remain super stable. I've cut the lighting back a bit to only 2x of the Kessil A350s for 8 hours a day.
We've seen a lot of coral growth and snail reproduction. Nassarius, black foot trochus, and stomatella snails have all reproduced baby snails 3-10mm in size. The nerites also seem to have laid calciferous egg sacks all over the rockwork so I'm expected baby nerites soon. We've also seen a lot of sponge growth, especially the small white pineapple sponges that show up as a tank matures. Without a mandarin our pod population is just exploding. Shining a flashlight at night causes at least 10-20 amphipods to scatter in the display or the sump. Coraline algae is growing like crazy and we're lucky to have a number of colors of red, purple, and green varieties.
With less feeding in the display due to no fish I have not been running a filter sock, which may be responsible for more sponge/snail reproduction without critters in the water columb being stuck in the filter sock. Most of the growth of small creatures has ended up in the refugium, which is a natural settling place for anything in the water column.
It's been a frustrating and heart breaking setback to lose fish, but we're in a good place to slowly re-stock and recover.