Dark Tips on Corners. Why? with pics

So I have 4 plants, and every one is starting to show some black/dark brown tips on the majority of the leaves (new and old). The colouring starts at the end of the leaf tips. and the tips on the edges are now starting to change colour too, working its way down the leaves. Some of the plants are experiencing this worse than others. This damage is worse near the top half of the plant with old and new foliage experiencing it. The end of some of the leaves (1/2") start to curl down and the black tips then curl back up (1/16")

ladies are 1 month old from seed. lights on 18 hrs, then off 6. While lights are on, temp is 70-75. watering starts when lights turn. I water every 3 hrs, for 7 mins each, using 1L/hr drippers. Growing in rockwool. Following the ultimate feeding program. every watering session consists of the following nutes per gallon: 5ml GH Flora Micro, 10ml GH Flora Gro, 3ml GH Flora Bloom, 4ml Green Planet Aussie, and 1 cap/10gal of Zyme. Reservoir is 15gal. Nutes are drained back into the reservoir. pH stays between 5.7 - 6.0. The air is replaced every few mins, and have a couple fans for circulation. Humidity is between 40-50%

any suggestions?

also nute solution temp is around 72

what are your ppms currently?

dont have a ppm reader. i just follow the recommended doses. they're a month old, but i'm using the amounts listed for week 2

Seems to me that you are almost to the point of over feeding them. Other than that they look great.

Maybe try cutting your solution back 1/4 strength. :jointsmile:

May also wait for some more feedback.:thumbsup:


begood,
befree

thats my guess as well,they dont seem to be suffering 2 bad.its a wise idea to get at least a cheapo tds meter,u can get the hannah primo for like $25. most nutrients makers push the limits.i always use way less than what is specified on a bottle and my ppms are right were they need to be.

Your plants look fine, if you worry about each bruise and scrape our kid gets we would all have MED cards. lol jk hmm not a bad idea though. but yea your plants tips are sensitive to lot o shit, it happens to me sometimes but it usualy it grows out of it.

it looks right for the dose u put in for the res, so the ppm should be 800-1000 put adding that (4ml Green Planet Aussie, and 1 cap/10gal of Zyme) may have boosted it up a bit, so if i was you i would add a gal of water or 2 to lighten the dose
extra shit:
foliar feed cause it cut a week down for veg(i use liqiud karma for FF)
try to get humiditiy to 60-70 it will grow faster

heres a Flora Nutrient Weekly Feeding Program
Flora Nutrient Weekly Feeding Program - Greentrees Hydroponics