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Tetras breathing from surface

3733 Views 8 Replies 4 Participants Last post by  Luckyyy, 
L
Hello, I recently got some cardinal tetra. The first couple of days everything was fine, but now they're breathing from the surface. I lowered the temperature and put on some extra oxygen. The nitrite is low and it's about 24celcius in the tank. Any idea what the problem might be? They don't do it all the time, but they've done it two mornings in a row now. The oxygen addition is off at night, so I can sleep. Got something to do with that? The other fishes seem unaffected.
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L

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Discussion Starter · #3 ·
I'm using the filter output to agitate the surface and get oxygen into the tank. I also have a small O2 pump that is not in use right now. The tank is semi-planted. I can try leaving the oxygen on at night and see if it makes any difference.
 
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Discussion Starter · #5 ·
I don't have ammonia and nitrate tests right now, but I can buy. I'll adjust the filter so it agitates the surface more, and do a water change. I'm not injecting CO2 right now. Should I? I have a CO2 system waiting to be added to the tank.
 
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