Rust colored blotches

[SmokedSinse12]

This just appeared over 2 days.
I did nothing out of the ordinary.

[LuciferN]

Here the troubleshooting form (http://boards.cannabis.com/plant-problems/127058-troubleshooting-form-yay-you-know-you-wanted-one.html) just fill this and we will try to help out.

[SmokedSinse12]

E-indoor or outdoor indoor
E-soil, soilless, coco, aero, or hydroponic soil
E-specific medium foxfarms ocean forest 25% potting soil, 25% perlite
CSL-Soil type/brand foxfarms ocean forest
SCL-Anything you have added to the soil 1bsp big bloom per gallon
SCLR-Soil or slab runoff pH 6.4
E-Water source tap
E-Source water pH 6.4
E-Age of plant 3 weeks
E-Type of fertilizer none
E-Rate of application (if hydro, this is your PPM number, preferably after each component is added) every 3 days
E-Lighting source and distance from plant 26w CFL 5 inches away(i need it to stretch)
E-Air temperature (both day and night if you are running a dark period) 70F 24/0
E-Air % Relative humidity 50
E-Lighting schedule 24/0
E-Type of ventilation your room has 120mm 60CFM exhaust, 80mm 30CFM intake

[SmokedSinse12]

I've been researching around and everything seems to be pointing towards MG deficiency, but I dont know why.
I use tap water which should have plenty of it, the TDS meter read it at 300.

[Help_Needed]

I've had cal/mag deficiencies (they tend to go hand in hand) before and that doesn't look like it. What it is, though, I'm not sure. But I've seen a lot of this stuff going around on this, and a couple of other forums, so it'd be nice to nail down a diagnosis.

On another post with spotting like this, they seemed to think it was a fungus of some sort. But they didn't sound too sure of themselves :P.

[SmokedSinse12]

Thanks lol, Im 99% sure its not a fongus lol.
And as for it being Mg def, its start to fall through.

On icmag its looking like overfert.

[stinkyattic]

Few things:
Take the blower out of your intake. IT will work better as a passive intake than as a mismatched active.
Your runoff is way low and you are locking out nutes.
You added the big bloom to the SOIL? Ooooh not good. And you are not giving actual fertilizer?
Read the flush sticky at the top of this section. Perform a full flush, ending with your base nute at 1/2 strength pH'd to 7.0. Your soil pH has dropped and you need to raise it. Potassium gets lokced out and your pants become susceptible to fungus, and yield suffers big time.

[stinkyattic]

Too late to edit... do you know your soil temperature by any chance? Cold acidic soil will give that exact symptom set. With straight overfert, you'd see more distinct tip burn.

[stoned88911]

What's wrong with bigbloom I just startted using it.

[SmokedSinse12]

Thanks for replying stinkyattic, I was hoping you would.
I've already flushed them, but the damage has already been done. :(

Big Bloom is an organic micronutrient and I add it to my water since day one at half the recommended dose. The plant seemed to like it just fine.

Temp of the soil is 73.9F

I just have one other question for you, my tap water.
The reason I get the pH down so low, is because say I leave the pH 6.4 water out, 2 days later it would be close to pH 7. I was wonder if that's the same case in the soil where over time water becomes more alkaline.

[stinkyattic]

That's because atmospheric gases dissolve into water that has been left out (air-equilibrated) and the CO2 goes into an equilibrium with the carbonate ion and carbonic acid and acts to raise the pH to near neutral. That is NOT a bad thing. Read the chemistry link in my sig for some background.
You don't need to let tap water sit out. Chloramine does NOT evaporate- it must be removed with activated charcoal or a RO unit. In non-organic soil grows, it's unlikely ever to be a problem for you.