Tiger Barb Lockjaw?

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DoubleA

Aquarium Advice Regular
Joined
Aug 29, 2012
Messages
90
Location
Northern Colorado
So I picked up a few Tiger Barbs from Petsmart the other day for the kid's 10 gal. Transition went fine, they happily joined the other Tiger barbs I had in there, didn't notice any problems until this morning when I went to go feed them. One of the new ones was hanging out by himself away from the others. Upon closer inspection it appears his mouth is stuck open? Nothing else wrong with him or any of the other fish at all, just his mouth stuck wide open...He tried eating with little to no success, and just looks pretty miserable. What's going on here? Anything I can do for it?

Water:
-pH: 7.0
-Ammonia: 0ppm
-Nitrite: 0ppm
-Nitrate: 5-10ppm
-Temp: 76 F
-Fish in tank: 5 Tiger barbs @ .75''- 1"
-Tank is 10gal. has been set up for 2 months ish now. Fully cycled.
-Filtration: AquaTech 5-15 Power Filter
-Last water change/gravel filter done 3 days ago. 20% change
-New fish were acclimated by floating bag for 1 hour, and adding small amounts of tank water every 10 minutes.
- No new plants/decorations, etc.
- They are fed alternately:
API Tropical Fish Flake
Ocean Nutrition Spirulina Flake

And occasionally either
Tetra Freeze-Dried Bloodworms
or
Tetra Baby Shrimp (Freeze-Dried Gammarus)
 
No ideas here?

I hate to see it suffer for long... guessing it's going to have to be an ice bath and the big fish bowl in the sky tomorrow morning :((
 
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