yellowing leaves :[

[lilkrip561]

im using fox farm ocean floor soil and distilled water with super thrive. but my big plant and baby plant are yellowing and im using them in the same tent with 120 watts on the big guy and 75 watts on the little ones. could the lights be the problem or is it my ph level??

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[BenfukD]

watts of what?...incandescent bulbs don't have the right spectrum..

 

[Sherrwood]

#1. You are way under lit .
You ask if its your ph that is off? Did you check it with a meter before feeding?
Should be 6.3-6.8 for soil.
To me it looks like you nute burnt it, more information would help.
How much super thrive did you give it and in how much water?

 

[The Hemp Goddess]

It is also better to start in smaller pots and then transplant up to larger ones. It can be very hard to give little plants the correct amount of water when they are in such large containers.

Like Sherrwood mentioned, the lighting is a problem. For a decent grow, you really need to get up to 3000 lumens per sq ft. When shopping for lights, remember that CFLs are the most expensive to operate of all the lights we use for growing and HPS is the cheapest. While initially it may appear that CFLs are cheaper and run cooler, when you get as many as you need, they are much more expensive, cost about twice as much in electricity to run, and produce substantially less bud than HPS.

Do you have ventilation set up?

 

[Hushpuppy]

That does appear to be overnutrient burn. The FFOF is a little hot for smaller plants, and will burn them many times when they are young. These should be ok as the nute burn appears to be from earlier. Don't add any nutes to them for several weeks or it will hurt them for sure. Also, as said above, you are way underlit. I don't think that is causing your problem but it will become its own problem later.