Orange spots on plants. Bacteria? Disease? I havent been able to find anything online

Hey guys! This is my first post here! I am working on my first grow, and have tried to prepare and research but ran into something thats stumped me. I am sure its due to inexperience, and I was hesitate to post, but I figure why not. I will include as many details as I can.

Problem: I have a few plants that are two weeks old tomorrow. Over the past two days, 3 of 5 have developed orange spots that seem to spread. It seems like abacteria, because everywhere it was orange, it now looks like faded green, almost velvet like. It seems like its eating away the top of the leaf.

Lights: 8 100w equiv. CFL's 5000k located about an inch above each plant. Total lumens: 12800 Growing space currently is 2' X 2 1/2' with wall to wall mylar
Soil: Fox Farms Ocean
Strain: White Widow/AK47
Invironment: 66/67 degrees at night, hovers around 78 to 84 in the afternoon. Humidity 50 at night mid 30's during day. (I keep the temp. sensor right next to the plants)
Watering: I've been watering at 8 in the evening, only when the plants are dry. Over the last week theyve been drinking 2 oz of water a day.
Nutrients:My closest guess to the prob. is over feeding. With this weeks Fri and Sat waterings, I gave a half dose of Canna Vega and half dose of superthrive. I noticed significant growth this weekend, but also noticed the orange spots.
Lighting: 18 on 6 off
I keep a circulating fan near the space 16 hours a day

I've also misted twice a day to try and accomidate for the low humidity.

I've left all my water out for 30 hours to get rid of the chlorine.

The tops of the plants look extremely healthy. They are about 4 inches tall and seem to be very bushy

Is this common? I've attached some pics. Any help would be greatly appreciated! :)

The third picture down is the best example of the problem area.

I would also like to add a few more details.

When I added the nutrients, I did use tap water. I beleive the nutrients lower the PH of tap water. When I water without nutrients, I use the water that has set out.

The water I spray, also has set out.

Thanks

Well my belief is over fertilization. FFOF is enough without any fertilizer and says so on the bag.....
\Get rid of the superthrive, it only causes problems.
Get a ph test kit, an aquarium test kit or some means of testing you want pH of 6.5 before you start adding anything.
Letting the water stand out to get rid of the Chlorine is a waste of time, and the water offgasses oxygen too, so not so good. I have proven that I get better grows by just using it straight out of the tap. Never use distilled or reverse osmosis water, no micronutes.
We also have a troubleshooting form that is a big help to figure stuff out, use it in the future, this was pretty simple.

Repot about every 4-6 weeks, and go to plastic pots, easier to transplant down the road....think of repotting as fertilizing with OF

That is solid advice from Washougal!:thumbsup:

All I can add is;
Read everything in Everyt'ing.
(That's the first link in my sig.)

You'd do well to read through the mythbusters link as well.
Put in that effort and you will become a master grower in months rather than years.

Now let that gal dry a bit and buy her some bigger, boots.
If you use FFOF add nothing but PH 6.5 water.

Listen to WW.
Throw out the SuperJive, and finish growing your tree. :)

Aloha,
Weezard

I appreciate the advice! I try and do a few hours of reading a day, and although the information varies from source to source, I feel like Im getting the idea. I switched to a bigger pot today, and the tops of the plants are looking good. The orange areas are still spreading on the bottom leaves. I now see them on all 6 plants, not just three. I cut the nutrients days ago. Is this still a sign of over feeding? I havent found a website that says anything about signs of overfeeding that include rapidly spreading bright orange spots. The tops of the plants have always looked 100% healthy, its just the lower leaves.