3 plants, 3 problems

Can anyone identify what the problem is with these plants? All are in veg.

Plant 1 is on the left, and is about 15 inches tall. She's a clone mother that grows quickly.



The problem started on the bottom leaves and seems to be working it's way up. Here is what her bottom leaves look like:




Plant 2 is on the right in that first picture. Her leaves have also shown damage starting from the bottom up. Here's a look:




Plant three is smaller, and grows slower. I noticed this same problem with spots on my first grow, and it got progressively worse until I chopped them down. The resulting product was shit.




These plants have

Fox Farms Ocean Forest.
Watering approximately every 5-7 days with distilled water.
PH of water before watering is usually around 6.5 before watering.
No nutes have been added so far.
I use a 400W MH bulb on a 24 hour cycle during veg
Temps are around 75 - 80F.
I keep the light approximately 18 inches away from the tops of the plants.

Any help would be greatly appreciated. Thanks!

Distilled water means no calcium/magnesium, which would create a deficiency, which would look just like this.

Temps are a couple degrees high, so just make sure you have a fan oscilatting on the top canopy of the plants, too. Lower the lights about 10 inches as well, unless your hand at the top of the plant feels too hot from the light when you hold it there. The fan is for this reason too of course.

Cant comment on much else as I'm a hydro girl, but hello from Canada too.

Good luck.........

pic 3-4 look like Mg deficiency.

Magnesium deficiency will exhibit a yellowing (which may turn brown) and interveinal chlorosis beginning in the older leaves. The older leaves will be the first to develop interveinal chlorosis. Starting at leaf margin and/or tip and progressing inward between the veins.

TokeSmoker420 said:

pic 3-4 look like Mg deficiency.

Magnesium deficiency will exhibit a yellowing (which may turn brown) and interveinal chlorosis beginning in the older leaves. The older leaves will be the first to develop interveinal chlorosis. Starting at leaf margin and/or tip and progressing inward between the veins.

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You sure sound like an expert when you copy what I type....................

Thanks for the reply. I gave them each a small amount of water with some Epsom salt and Calcium Citrate mixed in. I'm guessing the problem should clear up in a few days if this works.

researchkitty said:

You sure sound like an expert when you copy what I type....................

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i didnt even read what you typed ahah

These plants look simply hungry. You should have fed them already. I dont think its lockout or anything, You need to feed your starving girl. Like I always say dont take just my word for it. Get many opinions before doing anything. This site is full of good compassionate understanding people that help guys grow better.(Like MYSELF) There are even more A!$holes out here that think there way is the only way. Their usually wrong!