canary wrasse showing big bruise/bleeding?

i got a canary/yellow choris wrasse about a week and a half ago. I put it in a 10 gallon QT tank that was also serving as my ZOA QT tank. Zoas had been treated with flatworm medication in a separate bucket then placed into this tank. I have a lot of carbon in the filter.

So, this wrasse has been awesome. It was at the store for a while and did well and ate well and acted great for the time I have had it. It is active and helthy and beautiful.

Then today I come home and it has this 1/4" x 1/4" red bloody internal bruising or something... I can't really tell what it is. It is beyond the gut and in the meat of the fish, though there's a chance this is coming from the very end of the gut- hard to tell. There is no exterior damage to the fish like he got crushed by something and there are no crabs or anything in the tank (just added hermits today when I saw the injury).

This video MAY help, though it isnt that clear. It definitely looks blood red and the skin of the fish looks perfect. He is also still acting normal and eating happily

ideas?

https://youtu.be/tccsdQsjiwg

dang man sorry to hear that. not sure as you have stated that it couldnt be intake related as there is not external damage.hmmm?

damn, watched the video, thats a weird one, i hope it recovers...

So I posted this on another site too and a really experienced reefer posted this:

i have had several of my yellow coris wrasse do that also. generally it was after i just got them. never could figure it out, but they seemed fine after a few days to a week or so.

I find that very interesting. Might be a 'thing' with coris wrasses? I am going to have to look more into this... and I'll keep an eye on him and keep feeding him and see if this clears up.

looks like we have another saltwater mystery on our hands scoob.that wrasse had been in captivity for a little while and had never shown any negative signs.i hope there is an explenation but i suppose as long as he is good thats what really matters.

haha another mystery indeed! I googled coris wrasse bruise and found several other people talking about the exact same issue- wtf?! That's totally crazy. I really want to find out more about this. I hope it is simply a mechanism of their body that is normal. With other people reporting the same thing it seems this is just something they might go through in certain situations. Weird. I'll be looking into it more. Hopefully he makes it!

could it be like a color change from stress?

I vote viral. A lot of times these "breakouts" can be linked to a virus. Many of them are species specific. I know for a fact many wild caught banggais have an iriodoviris that can break out after and induction event (stress). Some live, some dont. No known cure. Make them as happy as possible and wait. Most are not communicable

well thats to bad that its not diagnosable and is one of those just wait and see games with livestock. hope this clears up.by the way did you get a second opinion from the other day?i was kinda wondering.i thought that he might say something right along these lines as the virus in this hobby are quite often untreatable and hard to diagnose.