Just set up a very simple DIY CO2
- a 3-liter bottle and a silicone tubing and a limewood airstone. Added 3 cups of sugar, 1 teaspoon of yeast, 2.3 liters dechlorinated warm water, and a handful of crushed coral. In 1-2 hours, hundreds fine bubbles per second come out of the limewood airstone, which place at the bottom of the tank below the AC HOB
outlet. The water from the AC
outlet blow the bubbles everywhere in the tank, however, I guess half of CO2
still escape to air.
How to improve it with a simple and cheap diffuse method to catch more CO2