>What size aquarium is this? How are you disbursing the CO2? What is the raw water >pH compared to the aquarium water? 65 gallon tank, I use a homemade diffuser that holds the bubbles under little (1") umbrellas. This worked fine with yeast. The bottle is a Sandpoint CO2 bottle. The tap water is 8.3 the tank is hovering at 7.55 (Electronic pH meter) Thanks for the attention, Bruce