What did it? Little 18 month old Alexander who loves to help daddy feed the fish is the answer. He decided a bubble a second was not enough and turned the CO2 up full throttle which in this case managed to turn the tank into a tank of carbonic acid overnight.
My mistake expecting he would never find the teeny little knob.
Very unhappy Fish Keeper
At least your "problem child" ;-) is 18 months old not 25 years old (See camphonic in tank in the archives)
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