What could be the problem???

No idea what's wrong. I had just watered with nutes. 4ml Cal mag, 4ml Micro 8ml Bloom. Day 47 Auto. Started noticing slow growth,small incoming leaves and the changing of the tips to light green. The other plant is still doing good.

Possibly some light burn by the way your leaves are yellowing near the top only, the tips are crisping and turning upwards too. All signs of light burn. What kind of light do you have and how close is it?

VIPARSPECTRA P600

wont be nitrogen deficiency on new growth, light stress is possible but i cant judge how close that is. Are you on 24 hours or 18-6?

18/6. I moved the stand the plants was on. So now they're lower now. I'll update in a day or 2

Izzy904 said:

18/6. I moved the stand the plants was on. So now they're lower now. I'll update in a day or 2View attachment 4905855

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I just experienced light burn myself for the first time several weeks ago when I got my new light! The leaves just tend to start looking old and tired despite being new before they crisp up. Slow light burn is still possible too so definitely keep an eye on it. Get yourself a good PAR meter that measures PPFD.

You’ve got a little nute burn it looks like from the leaves that aren’t yellowing the tips are browning. Check to see if your cal-mag has any nitrogen in it as that could be what’s causing it. Also the light color on the top leaves are classic sign of light burn.

Well on my next feeding tomorrow I'll be doing just ph'ed water at 6.5 ,hopefully it'll straighten it out if its not the light burn

Izzy904 said:

Well on my next feeding tomorrow I'll be doing just ph'ed water at 6.5 ,hopefully it'll straighten it out if its not the light burn

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I really think it’s overfeeding IMO. Light burn normally causes heat stress and I’m not really seeing a whole lot of those symptoms

Lowkeygardener said:

You’ve got a little nute burn it looks like from the leaves that aren’t yellowing the tips are browning. Check to see if your cal-mag has any nitrogen in it as that could be what’s causing it. Also the light color on the top leaves are classic sign of light burn.

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Nitro burn causes the leaf to crisp and point downward in a claw. Light burn makes the leaf curl upward and crisp.

Izzy904 said:

Well on my next feeding tomorrow I'll be doing just ph'ed water at 6.5 ,hopefully it'll straighten it out if its not the light burn

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Use this chart to determine what you should right after you take your latest measurements. It is an extremely helpful guide that has pulled me out of situations I wouldn't have otherwise done with the readings I was getting.

Are you in pre amended soil or some sort of pro-mix type?

Nah...just regular potting mix that I normally use

Here is a 4 day update. She looks to be doing better. I turned the light from 100% to 75% and lowered the plants

Izzy904 said:

Here is a 4 day update. She looks to be doing better. I turned the light from 100% to 75% and lowered the plants

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Glad to hear it! I love happy plants!!