I used fox farms ocean forest. And dr earth all purpose. Also on first watering I used a soil conditioner. Light is a marshydro ts 1000 set about 18 to 20 inches at 60% power. Nothing else added water schedule is 3/4 later every 3 days very little or no runoff
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Need more food, that 4-4-4 wont last long in the soil and you'll be chasing deficiencies, which is what you're beginning to see now. The soil has food to last about 2-3 weeks.
Raise light to 24" and run at 100%
Fish shit is for microbes in soil to help facilitate food to the roots, but if not much food in the soil it wont do any good
Needs more food, need to consider different nutrient source. Some of us run Maxibloom start to finish, no problems. When giving nutrients, its important to give enough volume there is about 25% runoff otherwise you'll get a salt buildup in the medium.
Soil is a buffer...my buddy won't stop PHing his water in his soil grow and can never seem to figure out why his grow sucks lol. Once I stopped the PHing, I'm seeing much healthier plants.
Add only FFOF as a top dress … medium has probably began to exhaust based on plant size.
Plant has acclimated to host medium by now - and top dressing ( water in ) will recharge it. See if plant will progress without other amendments . FFOF is nute dense an can feed it alone. Keep ph closer to medium ph ( ffof is 6.3 out of bag ) shoot for 6.6 .
Note : those affected leaves will not return to normal.
You are trying to stop progression . I believe the buffering within medium is beginning to wane - hence the top dress to recharge it.
I use this soil on all my layered mixes and have seen the pros and cons. Keep shit simple.