I think my Danio's mouth might be messed up

[daniodude]

I think somthing may be wrong w/ my Danio's mouth, he can't close it, it's always open, he can eat, but not too well. I have had him for about 5-6 weeks. He has lived that long, is there somthing I can do for him?
thanx
DD

 

[The-Wolf]

Does the fish appear to be gasping?

If so it could be
1] Hypoxia. Dissolved oxygen levels may be low, test levels early in morning.
2] Poor water quality causing gill hyperplasia, excess mucus production or nitrite toxicity. Check ammonia, nitrite levels and pH. Check that filters are clean
3] It could indicate the early stages of gill disease. If the condition persists it is important to examine 2-3 fish for gill parasites or gill disease.

I HTH

 

[daniodude]

I don't think he's gasping, none of the other fish have it, my nitrite's high, but I'm working on that. once I et my nitrite down I'll check and post

thanx
DD