Hey All,

So I did that experiment (negative control) I was talking about in my previous post:

Water Change + No Light = no Pearling

I checked my Tap water using my Drop Checker with home made KH4 solution) and it stayed blue indicating a lack of CO2 in my tap water (I just got my KH4 reference solution from Bill right this moment so I will do another experiment tonight to double check)

This means that Light is required to induce the pearling meaning that the bubles aren't from degassing of CO2, O2, N2 or methane from the water. The bubbles are deffinately being produced by the plants in the presence of light (Photosynthesis). On top of that, since the source of CO2 isn't coming from my tap water, it must be coming from the exposure to air (in concordance with what Tom has been saying!).

Ken T.