Identify deficiency

Hey, looks to be Nitrogen, starring from the bottom and working its way up. Yellowing but not dying or crispy leaves. The feeds your given them have very little Nitrogen Green snesation 0-3.9-8.5 + alga bloom 0.5-1-4.5 = Deficiency Contrary to popular belief N is very much needed in flower. Nitrogen does not drop down magically in flower it is a constant in the plant. Its why its called a macro nutrient not a micro. Don't get me wrong, it does require less of it, but the amount is not as big as people think and compared to other things is small. If you have anything with Nitrogen in it. Use it. something like a 4-8-9 would be nice to mix into that feed. If your really pressed for cash and need some Nitrogen just piss on the plant and water it in with 10 times the volume of piss to dilute it, just don't eat to much salt the meal before lol. Only other thing I can see being an issue is the PH. 6.0 is good but I prefer my plants lowest point to be 6.2 hovering aorund 6.4-6.5 Other wise doing good, keep it up. Good Luck!