First Time Hydroton Ebb & Flow Grow - Wandering pH - Advanced Nutrients pH Perfect?

Hey guys I am growing 4 plants in an ebb and flow system. I had some extra Advanced nutrients lying around so I figured I'd use those. They are the pH perfect technology line. I have a 100L (26gallon) reservoir feeding the system. The nutes are supposed to keep your pH dialed in for around a week, about the time you are supposed to do a res change. my pH keeps drifting up to like 7.1-7.4 and i check it every day and throw in a little pH down to get it back down to 5.5-6.5. I feel like I'm having to use too much pH down or too often. My ppm in week 1 were like 600, I just used some rapidstart and clonex clone solution, its like a mild nutrient you put in a cloning box. the plants seemed to be growing fine and colors were normal. Week 3 theres yellowing, interveinal chlorosis. this is my first grow with every aspect of this style, hydro, hydroton, ebb and flow, advanced nutrients. Week 3: 1500ppm, res temp gets to 74F, pH wanders up from 6.1 to 7.1 Any help would be appreciated, thanks.

From what I see possible ph lockout. Did you clean your hydration before using?

Those pebbles hold a lot of sediment, soaked mine in peroxide solution before use.

hsthompson1842 said:

Those pebbles hold a lot of sediment, soaked mine in peroxide solution before use.

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I did wash my hydroton, i soaked them for 3 days. I didnt really like scrub or agitate them. I should have put an air stone in or something. I also did not use hydrogen peroxide. I didnt have a lid on my res and the tank got algae, so I had to scrub everything down and i ran 3% hydrogen peroxide over everything to try and remove as much algea as i could. i also changed my feedings from once every 2 hours to once every 3 or 4 hours. no feed at night. i feel like the hydroton was always moist, and that may have been a contributing factor. it probably is pH lockout i just dont get how it stays in range. this grow got f'ed lol