Please help. Def. problem veg week 5

Hello guys. I need little help from you.
This is my first photoperiod grow (my autoflowers run was such a win win for me). So I am little scared. Today is end of week 5 vegetative stage. But i spot some type of deficiences or problems. On old leaves I spot brown marks, new leaves are nice green and healthy. Plant overall looks very nice. My conditions: I grow under 2x Mars hydro ts1000. Humidity is between 50-60. Temps are about 77 degrees fahrenheit. Im using Biobizz nutrients. Im stick with chart so Im using 2ml of grow + 2ml of acti vera in every watering. I grow in soil in 2 gall pots right now. Can somebody help me? Strain is Candy Kush express from royal queen seeds. Thank you very much. I want to switch to flower in one or 2 weeks. Thanks for every answer.

Dark green says it doesn’t need any more nitrogen right now. Calcium deficiency is predictable 4-5 weeks into bloom. If using cal mag definitely keep feed nitrogen low.

hotrodharley said:

Dark green says it doesn’t need any more nitrogen right now. Calcium deficiency is predictable 4-5 weeks into bloom. If using cal mag definitely keep feed nitrogen low.

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I dont use calmag righ now. Old leaves are dark green with brown spots. It looks maybe like cal/mag def. But I never heard about calmag deficiencies in vegetative stage

How's your ph? I had similar issues I thought possible phosphorous lock out. I flushed with proper ph and it recovered.

Fliperion said:

I dont use calmag righ now. Old leaves are dark green with brown spots. It looks maybe like cal/mag def. But I never heard about calmag deficiencies in vegetative stage

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That’s dependent on several issues including the water you’re using. If your water is poor in calcium you’re likely going to see calcium deficiency. And you’re not using it why?

What PH are you using to feed/ water with? That looks like early stages of PH issues, like a cal/mag deficiency due to the low or high PH

You're running out of root space and they are cold. Get them off of the floor and bump the temperature up to at least 82-84f. That will more than likely take care of it. I would so give them a foliar spray of epsom.
Good luck friend!

Transplant move on everything looks fine. Weeks away from flip.

Tap water ph is 7.1-7.2. After I add bio-grow and acti-vera ph is always between 6.3-6.5. I think this is good value. I can raise temperature and plants. I Am little bit sceptical because I never spot any deficiencies in this early stage of veg. I usually add calmag in fourth week in flower.
I really want try this strain because plant structure + short flower period looks really really good... I have 3 other plants in the same tent (same conditions) and those looks good without any deficiencies. Are you think flush is good idea or not?