My ph will rise at a constant rate all through veg. Ph down is a daily add. As soon as they start to flower the ph stabilizes until near the end when it will start a steady drop. Another good indicator of chop time. Glad to hear the aqua bugs are a no show, hope they are gone for good this time. Love the silica and use it every res. change. The liquid Karma looks like a great additive, all kinds of the right stuff in it. Heres a pretty good chart to help keep things going straight for you.