Hi, Dad,

You're havin' fun with your kit, aren't you? Isn't it great to have your water under such good control?

Personally, I would leave CYA alone and keep an eye on pH and Alk. If the pH slips any more, it's time for a little Borax. Most folks like Alk around 80-120 but you're not in any danger zone...a little baking soda would put you right in the ballpark.