When you say the mouth won't close, is it extended open like this?
Yes I would say so, let me grab a picWhen you say the mouth won't close, is it extended open like this?
Oh no I really hope this is not the case, how sure are you that this is columnaris? My water is at 75-77f on an inkbirdThis may be the disease Columnaris, and if so, (AKA duck lips), it is caused by a gram negative bacteria, which loves warm water.
Any water temps above 80F make it more virulent.
Any meds you try should contain an antibiotic effective against gram negative bacteria.
I usually just euthanize the entire tank, and sanitize anything including tank, tops, nets, tubes (everything) the water touched with bleach and start the tank over.
This bacteria can live, inert in a smudge of dry dirt, and reinvigorate when coming in contact with water.
The initial symptoms hard to see at first, but once it becomes apparent, it leads to quick death.
Others may have been able to address it with meds....I have not,, for me,
because it is so communicable and deadly, the chance of it spreading to other fish, and tanks, leads to euthanasia and complete sanitation.
Oh dear. I'm not really sure what to do, I'll try and net the meeki when I get home but it's not weak at the moment, I think I'll have to tear the tank apart to catch it and I'll try to pop it's jaw back inThe fish in my photos, arrived with two others," it" only appeared to have the disease, although the mouth symptoms were not immediately apparent.
It sat in a corner, colors intensified, not eating, barely moving. Luckily all 3 were held in a Quarantine tank.
I normally QT each new fish for at least 3 months.
The one with the jaw anomaly's died within a week of the obvious symptoms, the other two didn't show symptoms for about a month or two, then both also died of the disease.
Because I had never seen or had the disease before I didn't recognize it
I thought it might be a dislocated jaw (something I had seen before) and had pushed back into place.
When I tried with the fish above, the jaw was immoveable, it appeared to have atrophied completely.
You may want to try snapping the jaw of your fish back into place with your fingers.