And I'm sure Petsmart will refund with ammonia
i would have to say they will say.... no to that one.
this is a shop keepers view:
Ammonia is
YOUR problem not theirs. i think they will say something like this
"The Ammonia problem was caused by you not taking care of your fish tank. And after a sale of a healthy fish it is yours and no longer in out responsability."
im sure you never intended for this to happen. but look at it from a shops point of view. you (not saying that you did) could of intended to kill the fish because you didn't like it and wanted your money back. (they will do anything not to pay up for it)
if they do give you a refund.. well ide be amazed so good luck at proving me wrong

(and im not wrong often... Okay maby a little... Fine, sheash all the time!

)
Shang hi