Wow tons of information in here. Thanks to everyone that replied. I am glad to hear that my logic was correct in this.

Should I be adding more Co2 than I am adding? I have plecos, 2 flounders, a ropefish, a black ghost knife, and some aeneus (sp?) corys. I didn't want to go TOO low in Co2 as this DID happen once when I accidentally went into the yellow and my fish almost bit the dust.

I am acheiving green levels in my drop checker, but I guess I could add more, even though I am already at a rate of 3 bubbles per second with the ONLY surface agitation during daylight hours being a surface skimmer.