Does it say copper anywhere on those trichlor tabs? If so, don't use them. Contrary to popular belief, it is copper that turns blonde hair green and not chlorine like people think. If you are going to use those tabs (once you make sure they definitely don't have copper in them), then they will add CYA as they add chlorine. But, after awhile when your CYA builds up to 45 or 50, you'll want to discontinue using them and only use bleach. If you do decide that you are going to use them, you won't want to put all that CYA in separately, though.

Your other option is to not use them and just use bleach from the get go and add the CYA separately like I mentioned above. That is what I do. Your choice. Either way will work.