Neon’s mouth stuck open

doughboy52

We just noticed last night that A neon tetra’s mouth was staying wide open and it couldn’t eat as a result. The gills looked a little flared out as it was trying to pass water with the open mouth. We got it out and moved it to our QT and its mouth was suddenly better, but it’s hanging open again this morning. Anyone have an idea what’s wrong? Pix attached.


Tank

What is the water volume of the tank?
56g
How long has the tank been running?
4 months
Does it have a filter?
AquaClear 110
Does it have a heater?
Yes
What is the water temperature?
77F
What is the entire stocking of this tank? (Please list all fish and inverts.)
11 neon tetra
3 honey gourami
4 false julii cory
4 albino cory
1 guppy
1 lyretail molly
5 mystery snails
1 nerite snail

Maintenance
How often do you change the water?
Once a week
How much of the water do you change?
~30%
What do you use to treat your water?
Prime
Do you vacuum the substrate or just the water?
Python vac

*Parameters - Very Important
Did you cycle your tank before adding fish?
Yes
What do you use to test the water?
API Master
What are your parameters? We need to know the exact numbers, not just “fine” or “safe”.

Ammonia: 0
Nitrite: 0
Nitrate: 15
pH: 7.4

Feeding
How often do you feed your fish?
Once a day
How much do you feed your fish?
Roughly what they eat in a few minutes
What brand of food do you feed your fish?
Change it up daily for variety: Omega One Freshwater flakes, Ocean Nutrition Spirulina flakes, New Life Spectrum TherA+ pellets, San Francisco frozen bloodworm once every 5 days or so, and the neons will peck at any Hikari wafers or Omega One shrimp pellets that go in for the corys
Do you feed frozen or freeze-dried foods?
Occasional frozen bloodworms as noted above

Illness & Symptoms
How long have you had this fish?
~3 months
How long ago did you first notice these symptoms?
In a few words, can you explain the symptoms?
Have you started any treatment for the illness?
Was your fish physically ill or injured upon purchase?
How has its behavior and appearance changed, if at all?
 

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MacZ

One of my cardinals smashed into a food tablet a few months ago, and it took half a day of me worrying until it managed to yawn the jaw back into place. If this takes too long (more than 2-3 days) you could try and catch it and readjust it. But that should be your last resort.
 

doughboy52

One of my cardinals smashed into a food tablet a few months ago, and it took half a day of me worrying until it managed to yawn the jaw back into place. If this takes too long (more than 2-3 days) you could try and catch it and readjust it. But that should be your last resort.
Interesting. We noticed it at feeding time and it popped back into place for a bit after moving it to the QT. So maybe it will resolve like yours. Thank for the reply.
 

doughboy52

Update: the neon is now dead
 

MacZ

This is... unfortunate. Sorry for your loss.
 

doughboy52

This is... unfortunate. Sorry for your loss.
Thanks, and thanks again for trying to help
 

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