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Tetras breathing from surface

3735 Views 8 Replies 4 Participants Last post by  Luckyyy
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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Is it heavily planted tank? The plants consume the oxygen at night. If it were me I would turn on the air at night. Other things to look at: How much flow do you get from filter, and is the output from your filter creating any surface agitation?
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