Guava Auto Fastbud

Hello mate, so do you prepared the soil in first week of veg a then nothing more? maybe this could couse some problems with the macro nutrient at the end of flowering because you don't know how's going on inside your living soil. Anyway you issue seams the beginning of Ca defiency, check the Ca level in your water then valuate to add Ca/Mg product. I would add both to mantain the equilibrium considering you are using a living soil. Good luck and happy harvest!!

Calcium issues (deficiency) as well as a lack of P and K. All soil needs fertilizing eventually, especially by flowering time. Don't worry about the pH, up to 7.4 is acceptable, maybe not perfect, but ok. pH in soil can not be "fixed" by watering with pHed water/ferts..........you need to top dress with sulfur to reduce pH in soil permanently.

Have you been top watering every once in awhile? My Auto Tent #1 Diary is 3 Fast Buds Blackberry Auto that I was using a SIP system. SIP is bottom watering, kind of like Auto Pots. When I got to flower, my leaves started looking like yours. I was not supplementing with top watering enough and my roots didn't fill out the top of the pot because bottom watering systems only wet the bottom 1/3 of the pot. The roots searched out the water from below and because I wasn't top watering enough, they actually grew down into the bases. I removed the roots, stopped using the bases and started top watering. Issue went away but if I let the pot dry out even a little to much, the issue starts to show again. It was pretty much root bound systems, your roots may not be growing out the bottom but if you haven't been top watering enough in addition to the bottom watering then your roots may not have filled out the top as they should of.