Odd question but will MA want to see the dead Otto?
Research drip acclimitisation of new fish, far better than the "floating bag/ add water periodically" method.
Did you test the stats of the bag water? Some fish shops will use reverse osmosis water in their tanks with very little hardness, which means a much more cautious acclimitisation if you are using local tap water that is hard.
How was it?
Approx 0ppm for ammonia, nitrite and under 5ppm for nitrate.
Just got myself a new test kit.
Tested now and surprise surprise.... 0ppm for ammonia, 0ppm for nitrite, between 0ppm and 5ppm for nitrate.
Last water change was over a year ago when I moved house.
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Get very aquainted with "old tank syndrome" before doing a water change, the tank water chemistry is likely to be very different to that in your taps (far more goes on in the tank than ammonia/nitrite/nitrate)... Changing more than ~10% of your water per water change could kill any fish through shock.
For a start, if you have had fish in there and done no water changes for ~12 months, kH levels are likely to be very low and the pH rather acidic.
Just one thing Guru, it is pointless running air stones with Co2, you just cancel the Co2 out, water movement on the surface is enough to air the tank bud, you could run the air stone at night when the Co2 is off, Co2 not needed at night.