Good. See if it's come up from 50 since last tested, before you add more. One of us is confused. I thought you were adding CYA via the pucks (if they are CYA based, you are adding CYA along with the FC in the tabs, in case you didn't know that). And if you're also adding using liquid again, or granules, you gotta be careful about what the end result will be. Liquid will mix in and show up faster than granules or CYA from tabs. That's what I meant by "Depending on how you add it, the type of CYA and your circulation." Those factors determine how soon you can reliably test for CYA.