One Sick plant and two healthy

[HYSDOA]

Tases are my 3 little projects.
From left to right: King Kong(GG#4), Mr.Munster(GSC), Gouda(Cheese 00) I try to name the plants like the stain or holidays I start them by:smoking:

Cheese00 and GG#4 are the same age but Cheese doesn't have and buds(maybe a late bloomer?)

-Cheese has been turning leaves yellow brown spots for a couple of weeks,(thought I over fed nutes) I gave it a flush of about 4 gallons and cut off nutes for the past 2 weeks. I did that and the new growth looked healthier for a week or so then started yellowing again, the leaves are very light green and yellow. Today I just fed 1.5liters of ph6.8 water with 15ml kelp, 4ml unsulphered molasses
-----Why is it doing this?

-GG#4 is almost finished trichomes are mostly milky with just a few amber. Yet there are tons of new Pistils shooting up! I believe its cause I just got the new 600w light a week ago and I think its starting to foxtail... Im just letting it drain its leaves and fatten up.

-GSC is only 2 weeks old and striving! This is my first grow in a small 3liter pot(or jug?) If I can yield close to what im getting out of the 5gal buckets im going to start SOG.

-Soil: BioBizz Light Mix, perlite
-Lights: Viperspectra 300w, unbranded 300w that came with tent kit, Growstar COB 600w
(left to right)Light heights from canopy: 20in, 30in, 14in
-Nutes: Kelp concentrate, calmag, fox farm, molasses
PH: Water 6.5-7, Soil 7
-Light Schedule:19/5

 

[NorthernLights_420]

I think the sick plant is underfed and possibly over or under watered? Or maybe root rot? Idk for sure exactly but some possibilities.

 

[HYSDOA]

It could be underfed, I have not given it nutes for like 2 weeks just ph'd water and calmag. I did feed kelp and molasses tonight.

Could it be light burn? The 600w seems big to me, im not sure if 1200w in a 22x32 tent is too much

 

[NorthernLights_420]

Yellowing of leaves means underfed on Nitrogen. Nitrogen is responsible for the green in your leaves and plays a huge role in photosynthesis. If the leaves all turn yellow the plant will die because it wont be able to take the light in and all the leaves will fall off eventually. Overfeeding on nitrogen the leaves wud turn dark Green and the leaf tips wud curl downward indicating too much N. Attached is pics of a nitrogen deficiency (yellowing) and N toxicity which is dark green and leaf tips curl down.

 

[NorthernLights_420]

I bet shes definitely underfed also. This is what a potassium deficiency looks like. You should know all 3 main micro nutrients=NPK deficiencies and toxicity you can learn to read your plants. Next will be phosphorus I'll post some more stuff for you bud!

 

[NorthernLights_420]

Heres lots more good knowledge to help on your journey. Phosphorus deficiencies. You shud look up P and K toxicity on Google so you can read your plants yourself. Best of luck growmie. If you have any more questions always ask. Lots of cool ppl here

 

[HYSDOA]

Gouda is starting to have healthy new growth. The older growth is still effected, but less dying leaves everyday! Im going to feed a little heavier for a few weeks then go back to lower doses I still can't tell if King Kong is just still flowering(trichomes are 70-80% milky) or if my new 600w is stressing it too much and causing it to foxtail?