Light Burn?

Hi, i am after some help please.
I am thinking its light burn ie. leaves are taco-ing and the upper leaves are more yellow than the lower ones but need some 2nd opinions.

Photo from clone.

Plant is about 5 weeks into flower.

Medium is BioBizz Light mix compost.

I was feeding
Biobizz Grow @ 1.5ml per litre,
Biobizz Bloom @ 3ml per litre.
3g Epsom Salts dissolved into 10L (2.5gal) water
1ml per litre liquid seaweed.

I have recently changed over to Hydrocrop, my other plants are loving it and so far are showing no problems.
These symptoms were showing before switching to Hydrocrop. (was hoping if its a nute defiency and would clear up)

Temps are
Lights on 30.C (86.F)
Lights off 26.C (78.F)

She is in a 20L (5gal) fabric pouch and she drinks regulary every 48 hours.

Light is a Lumatek Attis 300w and its about 30cm (1 foot) above canopy

I don't think it's light burn if your LED is 1 foot away above the canopy, it could be heat stress due to the temps being 30c. But it looks like it could be a nutrient deficiency or a lockout to me. I could be wrong though, I'm not 100% sure what the issue is but if I was a betting man I would say it's a nutrient deficiency or a lockout.

Heat looks like the main issue.

Heat is ok if you can keep the root zone cool/moist.

Looks as if the roots are cooking/dying at the edges of your pot especially if they are fabric pots.

The buds look a little stressed as well? But could just be genetics

Nutty sKunK said:

Heat looks like the main issue.

Heat is ok if you can keep the root zone cool/moist.

Looks as if the roots are cooking/dying at the edges of your pot especially if they are fabric pots.

The buds look a little stressed as well? But could just be genetics

Click to expand...

So turn down heat?

Its currently on a heat mat set to 30.C (86.F) that only comes on at lights out.

I have grown this strain for over a year now ( clone from clone etc....) and my other ones are looking perfect atm, using Hydrocrop.

Fish scale said:

I don't think it's light burn if your LED is 1 foot away above the canopy, it could be heat stress due to the temps being 30c. But it looks like it could be a nutrient deficiency or a lockout to me. I could be wrong though, I'm not 100% sure what the issue is but if I was a betting man I would say it's a nutrient deficiency or a lockout.

Click to expand...

Usually when leaves are pale on top but green at bottom its a macro nutrient issue, in your opinion whats' your gut instinct?
But the tacoing leaves led me to think its heat or light stress, but i am unsure.
I wasn't sure if its light burn or a Mg lockout

subudai said:

Usually when leaves are pale on top but green at bottom its a macro nutrient issue, in your opinion whats' your gut instinct?
But the tacoing leaves led me to think its heat or light stress, but i am unsure.
I wasn't sure if its light burn or a Mg lockout

Click to expand...

It's a nutrient deficiency or a lockout or some other issue. I doubt it's light burn from a LED light. It's not like it's a HPS bulb and you have got it really close. If your light was too close those top buds would be light bleached from your LED but that's not the case.

subudai said:

So turn down heat?

Its currently on a heat mat set to 30.C (86.F) that only comes on at lights out.

I have grown this strain for over a year now ( clone from clone etc....) and my other ones are looking perfect atm, using Hydrocrop.

Click to expand...

Remove the heat mat. You are probably cooking the roots. The root zone wants to be about 20 - 22c. not 30c. You are cooking the roots.

subudai said:

So turn down heat?

Its currently on a heat mat set to 30.C (86.F) that only comes on at lights out.

I have grown this strain for over a year now ( clone from clone etc....) and my other ones are looking perfect atm, using Hydrocrop.

Click to expand...

Are the others on a heat mat set to the same temp?

As Fish said, roots wanna be around 20c tops.

When you have more than one issue coming up at the same time it’s usually pH related or roots issues.

Nutty sKunK said:

Are the others on a heat mat set to the same temp?

As Fish said, roots wanna be around 20c tops.

When you have more than one issue coming up at the same time it’s usually pH related or roots issues.

Click to expand...

No they are not, i have a tube heater in there that comes on at lights out.

I have removed the heat mat on Saturday, temps have been 22.C lights out & 30.C lights on.

Thanks guys for the advice

subudai said:

No they are not, i have a tube heater in there that comes on at lights out.

I have removed the heat mat on Saturday, temps have been 22.C lights out & 30.C lights on.

Thanks guys for the advice

Click to expand...

Well that explains it! Better temps now. Might not see the biggest response considering its age/condition but growing is all about learning from mistakes!