04-30-2008, 08:21 PM
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Sounds exactly like a parasitical disease thats been occurring in Corys farmed in Asia the last few years. I've read about it. Apparently, it affects their nervous system, causing them to race madly before death, after acting normally for days or weeks.
If I can find the link to that disease I'll post it. Can't be completely sure that's what happened to your corys, Steve, but it sure sounds like it.
PS. Panda corys do much better in the low 70's.
From the wiki pedia:
Corydoras panda inhabits clear river waters that are relatively fast-flowing, well-oxygenated, and flowing over substrates that may comprise soft sand or fine gravel. These rivers are usually well vegetated with assorted species of aquatic plants. The proximity of the home rivers of the fish to the Andes mountain range, and the replenishment of those rivers with meltwaters from Andean snows at higher altitudes, has led the fish to be adaptable to cooler temperatures than the norm for 'tropical' fishes - the temperature range of the fish is 16°C to 28°C, though the fish exhibits a marked preference for the cooler regions of this temperature spectrum, particularly in captivity. Indeed, the fish can, for limited periods, survive temperatures as low as 12°C, though captive rearing at such low temperatures is ill-advised. The native waters of Corydoras panda are consequently mineral-deficient, with a neutral to slightly acid pH, and replication of such conditions in captivity are recommended for successful maintenance.