Thanks for that congealedmeat. I cut back to half a tablet and watched them finish it. I also did a 25% water change today. After giving them time to relax from the excitement, I went to observe them. After the water change they seemed to be *very* active, they were swimming all over the place but one in particular seemed to be in some sort of frenzied swimming against the glass and looking like it was going to explode (hard to describe but this fish looked hyper). It also seemed to be "rolling" in the sand periodically. Sorry to keep posting the minutia of what is going on but I must say it is sometimes hard to determine what is normal with these guys. Still no sign of white spots or listlessness or loss of appetite or any other symptoms that would say for sure that these guys are sick. I was thinking briefly that it would be a good idea to treat for ich but it seems that most of the medications are quite dangerous to corydoras. The salt\temperature treatment may not work too well in my setup as I do not think my heater will be able to maintain stable temperatures as high as is often recommended to treat ich. I was also wondering what corydora eggs look like? Could that be what I am seeing stuck on the glass (trying to be optimistic)?