04-03-2008, 05:18 PM
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If you the numbers looked good, then let's view some other options that could have killed the fish:
1) Disease - this is the most likely, but not simply because it came from Petco (if it even did). Some Petcos are wonderful for buying fish, some are very much not.
2) Stress - if the fish was stressed for some reason (long wait in the plastic bag, major water temperature change, etc), then there's a slight possibility that it could have died slowly from the stress. This is much less likely than option number one.
3) Fate - Your fish was fated to go to fish heaven or hell, whichever the case may be.
The good news is that you can take the fish back the store and they will most likely let you get a new one free of charge since it died so quickly. If that one dies, then you know it's something with your tank rather than bad luck on the first one.
Hope that helps,