So you've had them less than a week, but I'm assuming they're all doing ok and seemingly behaving normally - otherwise I believe you would have said so.
Well you know, I've kept many different Corydoras over the years, and one thing I have to say about them is that occasionally they can be very playful. It sounds like that one in particular is quite playful - and that might just be normal behavior for him or her - so don't worry about it, and just enjoy that one's particular personality.
Please keep an eye on it though, to make sure it takes a gulf of air once in a while (Corys need to do that) - while you do have a 20 gal tall, that should not prevent those 4 Cories from reaching the top for air when they need it.
It may sound stupid but it kinda looks like the fella is trying to escape. Ibdidnt see anything abnormal except for the cory. Oh and the shine in its eye. Nit sure if thats because the camera or something else
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I know Cories go to the top for oxygen, but they usually fly to the top and fly back down. Mines do it all the time, but I have never seen they just swim around the top. It might be that there isn't enough oxygen in the tank.
Once again, I had that same thought. But when they go to the top for oxygen they actually gulp some air by breaking the water surface and you can see them do that.
But if you look at the video closely, you'll see clearly that at no time does the Panda actually break the surface to gulp air. If there wasn't enough oxygen in the tank water, he would most certainly be doing that, and you could spot it clearly.
Can you guys check video out and let me know if this is normal panda Cory behavior?
http://youtu.be/JqgJpWSLSz8
Any help appreciated,
Patricia
I have seen this a couple times over my 25 years with wild corys, but no, it is not normal. I would suspect some internal problem. It will almost certainly not recover, at least those I have had did not, and I am not aware of anything you can do other that maintain good water quality and leave it alone to avoid further stress.
Is this fish isolated in a QT? Or are the others in this tank too?
Corydoras as I frequently mention are highly sensitive fish. Whether this behaviour is due to extreme stress and trauma, or whether it has been internally injured during netting at some point along the way to your tank, I can't say.
Byron.