Unusual Behaviour?

[natcat]

ive just got 3 new masked cory to day
and i noticed that the tanks become a lot more active i have 3 albino and 1 juli also and all cory have taken in a lot more air from the surface and all are around in the upper layers??
should i be worried???
all sats normal (wide 10 gallon tank)
any advice welcolme??

 

[Inchworm]

Hi natcat

I don't like the sound of this. If you could give us some more information it would help. How long has the tank been set up? What's the water temperature and the actual ammonia, nitrite and nitrate readings, if you have them. What other fish are in the tank? How often do you vacuum the bottom and change some water?