Been dealing with sick fish so I suppose it's time for an update...
A couple days after that last set of pictures, I lost one of the anthias. It was fine one day, then the next day I noticed what looked like an internal bacterial infection; I could see red streaking under the skin, its fins were clamped, mucus was collecting on the gills, and it refused to eat. It was a goner within about 36 hours...and unfortunately it wedged itself into a rock and I was unable to remove it.
I initially suspected flukes, so I treated the tank with Prazi-pro for 5 days just in case.
None of the other fish showed signs of infection/infestation, but I also decided to make up some medicated food for them using frozen mysis, Flagyl (metronidazole), and Selcon. Within a day of starting treatment anthias #2 showed signs of bacterial infection on the edge of a dorsal fin...so I crossed my fingers and hoped I'd gotten ahead of it. I also took the auto-feeder off line; it had been setup above my return pump, but I'm pretty sure most of the pellets just sat in that chamber and polluted the water rather than ending up in the DT. I figured improving water quality was more critical than getting in the 1 extra feeding while I was at work. 5 days in, I did a 20% water change and put the skimmer and carbon back online to remove the prazi-pro, and the fish were still eating the medicated food with gusto.
2 days later (Day 7 of treatment) anthias #3 stopped eating...figured maybe it was getting tired of the medication so I started feeding cylclops to just get them to eat. They took to that immediately, but a day later #3 showed obvious signs of internal infection (redness, clamped fins, and gasping)...upon closer inspection yet another anthias (#4) also had signs of a minor internal infection (they both had minor red streaking at the base of their tails). Aaaaagh!!
I did another series of small 5 gal water changes, added a few drops of ZeoBak after each water change, and added an air pump to the DT to help saturate the water with oxygen. I also took that medicated food mix and added some Rod's to the recipe...I figured if it stunk like fish enough then maybe they'd ignore the fact that it had that bitter antibiotic flavor. That seemed to work as the fish's appetite came back immediately. Over the next few days their symptoms started to disappear; the bacterial infection that started on the fins of anthias #2 cleared up almost completely, and the red streaking completely disappeared from #4 while #3 still had a small blotch at the base of the tail, but the redness had receded significantly.
Being that they seemed to be fighting off whatever was going on, I continued to feed the medicated food 2x per day, and kept an eye on things. I know...I know...I should've pulled the fish out long ago. After losing those chromis in QT though I figured I'd take my chances with leaving them in the DT to fight off the infection rather than tearing the tank down and medicating with Maracyn-2 in a hospital tank.
So far so good though...no more clamped fins, and only one fish still has a small red blotch at the base of its tail that has been getting smaller by the day. I'm still doing the medicated food 2x a day and will probably continue to feed that until I see no symptoms for 14 consecutive days. I also added a 25W UV filter on Saturday, which should help cut down on any pathogens floating around in the water column. It looks like they'll be fine though...I'm going to continue to do 2 smaller bi-weekly water changes and keep an eye on things. I wish I had taken pics of the fish to show...but I kept the DT lights off and tried to keep my face away from the glass as much as possible to keep them calm.
If only these fish knew what we go through to save them.