Is there a difference in CO2 solubility between soft and hard water? I'm asking this 'cause I'm never able to see those small "almost-imposible-to-see" microbubbles completely disolve on the way to the surface (after being atomized by the powerhead). Even smallest of them manage to the surface. I'm using yeast CO2 system and water hardness is around 12 dGH and 15 dKH. Davorin