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After what I've read, I can see magnesium deficiency and maybe a ph-fluctuation. I did a ph-test, and I got a very light green color. I guess that indicates I've got a PH between 6-7 which is perfect? And I doubt I'm overwatering them..The soil is always very dry before I water them.

It is getting worse, and it seems like the growing has stunted a bit. The leaves are very crispy too. Also, the leaves are hanging downwards.. I think it started after I fed them biogrow and alg-a-mic, I have a very nutrient-rich soil..

The temperature varies from 77-84F. Humidity varies from 35-55, usually stays at 40. The plants are 22 days old, I started LST'ing them recently. I've fed them twice with alg-a-mic and biogrow. The plants were looking real nice and green until a few days ago, when this started happening...

Doubt its the HPS.

Hey, there are pictues from two different plants - both White Rhino. I grow in soil, and the plants are around three weeks old. Ive fed them Biobizz Alg-a-mic and BioGrow. I water them every 2-3 days. I grow under a 400w HPS. Plant one: plant two: I havent noticed the problem before, so...

A 250w HPS or 400w HPS!

I actually have 3 fans connected to a motherboard that is outside of the closet.:p

So..Yesterday I installed a 185 CFM exhaust-fan and I closed the door for 4 hours. When I came in to check my babies the temp was at 97 degrees Fahrenheit! I guess the only way out now is a cool-tube? Is it hard to install?

Thanks for the help, I will return the exaust-fan and buy a new one with 185m3/h instead. Hopefully it will help out and bring the heat down, and I can close the doors.. Cause when I keep the doors open, the humidity goes way down and I need to spray the whole closet with water many times a day.

Alright, I'll need to fix that. Also, the closet is not air-tight and I keep the doors open. Will it help to make the closet air-tight, and let the fans do the work?

The exaust-fan: 98m3/h The inline-fan: 105 m³/h

Yeah, one exaust fan and one inline fan. CFM? The closet it 180cm x 90cm x 70cm. Thanks for the reply =)

The soil is around 34 celcius degrees, and the air is around 28-30 when I keep the closet-doors open. What do to? And will a circulating fan help much?