Hey gogi, see you're not getting a lot of interaction here.. not sure why with all of that beautiful color you have going on. Ladies are looking real sweet brother, can't wait to hear how much you harvest!
I've done a lot of research on those C02 tablets man, a lot of folks say they're not that beneficial because C02 in the root zone doesn't do jack. Some people have said possibly foliar spraying with them, but I've never tried it - I have tried foliar feeding with carbonated water and I didn't get anything besides some funny texture to my leaves. Didn't notice better growth but with the tablets it may be different.