12-15-2011, 01:48 PM
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I agree with using a water conditioner regardless.
I wonder, though... Could the problem have been that the tank was heavily stocked, but at the lower temp their metabolism was slow. Then, when you added the heater, the higher temp sped up their metabolism thereby making them produce more waste which, in turn, produced a strain on the biofiltration and caused a lethal ammonia spike? That's my theory, anyway.
Ultimately, I suppose there's no way to know now.
In any case, I wish you the best of luck with your new fish, and I hope you enjoy your new 55g when it comes! Good luck!