brown spots and brittle leaves, Please Help

I have three plants currently growing under a 600 watt hps, 2 seedsman white widow and 1 dina fem critical +. they're 34 days old from seed. I started noticing last week that the bottom leaves were starting to get brown spots and they were very brittle. The temps in my tent stay under 80 and I'm only feeding them half strength nutes. Has anyone seen this before any info would help. The lights come on in 15 minutes some I'll post some pics soon.

Hydro or soil and some pics.

I'm using pro-mix in 3 and 5 gallon pots and the nutrients are fox farm.I'll post pics as soon as the lights come on.

https://www.rollitup.org/marijuana-plant-problems/620606-my-plant-dying-please-help-3.html#post8628663

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Here's some pics. Any ideas???

They look hungry imo.. Looks like the 50% nutes isn't cutting it for your girls ..

I just fed them yesterday so I'll have to wait a while to try that. I am feeding them with grow big and big bloom every other water which is every 4-5 days,depending how dry the soil is.

Have you tried giving them a good flush? Nutrient lock out will present the same as a nutrient deficiency, but adding more nutes will only worsen the issue.

Thundercat said:

Have you tried giving them a good flush? Nutrient lock out will present the same as a nutrient deficiency, but adding more nutes will only worsen the issue.

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Haven't tried that yet. I transplanted them 8 days ago 1 into a 5 gallon bag and the other into a 3 gallon bag.

Its completely possible they got locked out, I'm not saying it is the problem, but its often something safe to try that can make a big difference.

Thundercat said:

Its completely possible they got locked out, I'm not saying it is the problem, but its often something safe to try that can make a big difference.

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Thanks man I'll try it out next time I water them. But if anyone has had problems like this please pm me or post some info on this threads. thnx again.

Honestly you can do a flush at any time as long as your soil has drainage. The flush process should wick air into the root zone again as long as you have drainage and aren't gonna leave them in a swamp.

Thundercat said:

Honestly you can do a flush at any time as long as your soil has drainage. The flush process should wick air into the root zone again as long as you have drainage and aren't gonna leave them in a swamp.

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So should I flush them today? And is it ok to do it with regular tap water in the tub?

You want to flush with clean PH'd water and in the tub works just fine. You want to flush 2 times the volume of the pot they are in. So 3 gallon pot flush with 5-6 gallons of water.

Thundercat said:

You want to flush with clean PH'd water and in the tub works just fine. You want to flush 2 times the volume of the pot they are in. So 3 gallon pot flush with 5-6 gallons of water.

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Thanks for the help man I'll definitely try this in the morning.