OK I have the fluval 88g tiny tank set up.ceramic diffuser. With a power head pushing all bubbles downward and around tank. They DO stick to plants. I've watched for hours pearling but not from oxygen. Is from co2 I have a hob filter 440 emperor that pushes water across and down so bubbles never make it to surface. Is in a 30 gallon cube 20/20/20. I'm not understanding this pearling talk cause I've watched my tank co2 never get to.surface unless 1 thousand times smaller than they started and are invisible. My power head has bubbles my inlet on filter has bubbles. I really don't understand this. What is the temp you guys run for tanks and plants. I have mine up to 85 so I understand cooler water more dissolution of co2.