I loled at the MTS misunderstanding xD
thats some funny stuff.
jbulmann, take those readings like you said you were going to do, and see if you find ANY ammonia or/and nitrite. this would indicate a sort of mini cycle that your tank is going through.
IF you happen to have a lot of money to spare on this hobby, I advise you get some of this stuff:
H2O-PURE Freshwater
It's from the maker of Bio-Sphira and it should work. this will add any necessary bacteria to your tank, and quickly make your tank safe again.
However if you fish are already poisoned, they may still face their fate
Still its a handy product to have