Fish dying?! Gasping, darting...HELP!

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Jed Fish

Aquarium Advice Apprentice
Joined
Apr 10, 2014
Messages
25
Ammonia levles are just under 0.25ppm, nitrite is 0ppm and nitrates is between 0-5ppm. one fish is at the surface, literally trying to jump out, its darting around and seems to be gasping.

Its a neon tetra, part of a school of 6. All 6 have been in tank 4 days. Tank is cycling. I recieved filter media from established tank 2 days before I got fish. 6 tetras are only fish in my 70L tank.

I just finished a 20% water change, but the fish is still abnormal.
I am not over feeding.
I use water conditioner and nutrafin cycle.
Filter is fine and temperature is 26C.
Water is clear.
Fish was fine yesterday, started abnormal behavior couple of hours ago.
so far in the cycle, ammonia has not gone higher than 0.25ppm. Nitrites always been 0ppm.

Should I do another 20% water change? Or should I do it tomorrow?
 
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