He was dead when we woke up this morning
That said, I did see the "grains of salt" on him (see picture in first post), and several of the other fish seem to have it as well. So now I'm not sure where to go from here. He had no visible injuries on him-I looked all over. I never once saw him bullied, but as mentioned that doesn't mean it didn't happen at night. My tank is always completely still when I check it at night... the "bullies" (damsels) only bullied each other over their territory, they haven't tried any of the other fish
yet. Sailfin was really peaceful.
Did not know that about Caulerpa-I have it in my sump so figured it was worth a try. I saw him pick at it before when I put it in. I was trying anything I could think of. Also had an algae sheet. Didn't eat anything but he had gone downhill fast and I think it was just too late. Whatever it was had done it's damage.
I never saw it flash. All of my other fish are eating voraciously. None of them are flashing either.
So from here, should I just keep an eye on things to see if anyone
stops eating? Could the "grains of salt" be anything
other than ich? If not, I'm assuming the proper course of action is to remove the fish and do a hypo treatment in QT? That's gonna be a huge ordeal but definitely worth it to get ich out of the DT.
Can Ich come in on live rock? I know it needs a fish host but can live without for a certain amount of time <6 weeks? Reason I ask is we have avoided fish from the LFS since we ALWAYS see visible Ich on their fish and they have no quarantine procedures... but we DID get live rock from there... they argue that Ich can be in the tank and fish are just "strong enough to survive it"... but that really doesn't solve a problem even if it is true-from my understanding that leaves any fish a target should they get stressed or weakened for any reason, especially new additions, correct?
So I guess my questions are:
1) Where do I go from here?
2) Do you think it was Ich? Parasites? Something else? We may never know?
3) If I can't feed Caulerpa, and it tends to go sexual...what do you recommend for sumps? I have some Chaeto, but it breaks apart and gets in to my third chamber or hung up on the sponge I put to keep it out of the third chamber... am I doing something wrong?!
4) What about my other fish? Keep an eye out? Remove and treat with Hypo? Prazipro? Without knowing what happened, I don't want to cause undue stress...
5) Could the white specks be anything other than ich?
6) Could the Ich have come from the live rock?
Thanks guys! I really appreciate the help and insight you have provided!