sick corries

[Da Squid]

I've gotten them from two different sources, both respectable in my area. My first buy was 8 corries that I think I've identified as emerald. One died every 4 days or so until there were only 3 left, but the 3 remaining are doing fine now.
When it looked like the trouble was over, I bought three spotted corries. One died a week later, then the other one died a few days ago. The last one's gills are still going at an incredible rate, though at least he spends most of his time at the bottom of the tank.

[Blueiz]

Ask these stores what there sources are, there is a good chance that they get fish in from the same company. I know that I had purchased an oscar from my ls and it did poorly, everything checked out in my tanks so I mentioned it at the lfs the next time I was in. I was asking him when he may be getting more in and he told me that the company he gets his fish from was having problems with there oscars at the time so he wouldn't be getting anymore in for a while from that source.

Another thing to find out form the lfs is what there water parameters are and see if yours are a close match.

I mentioned the low temp before, o2 saturation is higher at cooler temps, so that should cross out the concern about not getting enough o2.

What do you put in your tanks when you do a water change or for ferts? Since the usual stuff seems to check out ok, looking for something more in depth.

You could just be like me where snails are concerned, I cant keep them alive for more than a month..lol.