5 weeks into flower, what's your opinion?

Organic grow in 5 gallon pots with ocean forest soil.
Recipe 420 recharge 6-8-4
G&B simples fish bone meal 3-18-0
E.B. Stone Sul-Po-Mag 0-0-20(npk)-- 20-10-21 Po-Mag-Sul
Tap water that has sat and daily circulated and aerated. Ph7.2
Watering every Wednesday and Sunday 8-17 fluid oz. Depending. Since flower been watering 8 fluid oz on Friday and 17 fluid oz on other two days.

Temp and humidity staying around 80°f and 55-58%h. Slightly cooler at night sometimes.
Mars hydro 1000 @100% and 18-19 inches away

Middle older leaf that I took off last night and put in a Dixie cup until I dug it out and unfolded it. What do you think the problem is?

Can you water to runoff and check runoff ppm and ph?
Or at least PH, ppm isn’t as critical in organic.

I watered last night first thing when I opened tent. Then after watering I looked over plants and noticed just a little on the three plants. Didn't think much of it just pulled a couple off and left a couple. Closed the tent up and went bed. But then considered options.. instead of waiting till it's to late.
and that was one of the tests I want to try. ( Keep It Real). Thank you.
I did a mini test of my water and the three amendments. 8 fluid ounces of water and a dash of the three to be about exact, shook it up real good and the pH was 6.3 instead of my tap water of 7.4.

But for sure in a couple of days on my next watering I will water till alot more runoff and test the plants medium pH. Been trying to keep the runoff to zero(been working so far).
Wedding cake strain.