09-02-2009, 11:03 AM
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Sometimes the best treatment is no treatment. If you keep a check on water quality (pH particularly in an established tank) and do the weekly pwc, you're probably doing the best. Trying to diagnose some unusual behaviour is not easy, and given the sensitivity of Corydoras to any chemical and medication including salt, I would leave them alone. Beyond this, two comments.
First, corys are odd fish at times; some have a habit of "fainting" and just flop over on their side and sometimes even on their back, motionless for several minutes but still respirating. After maybe 20 minutes they right themselves and swim normally. Some are more prone to this behaviour than others. I've had my present three C. panda since January, and about 3 months ago one of them did this faint; never noticed it prior nor since.
Second thing is that pandas for some reason are frequently difficult to maintain. I've mentioned elsewhere that given the fact that this species is now commercially raised, not wild caught, you would think they would be hardier rather than the opposite; this may indicate that tank raising fish cannot eradicate the fish's natural biological makeup. Most of us who have maintained various corydoras species for many years still find C. panda the most sensitive and delicate.