Help

This is one of my bubble gum clones that has a gone a little brown. The plant as a whole looks great. I haven't been giving it any nukes yet and i just changed the cycle from 24 to 18/6. I just got my PH meter and the water I was feeding it was almost 8. Would that have caused this? Should I be concerned? Should I also test the PH of the soil?

your ph is a little too high. what soil are you using? if there is bugger all nutrition in the soil then your about due to start nutes. if you used a good quality soil then your problem is due to ph lockout. can you check the ph of your soil? soil should be around 6.5 I think.
Good luck.

Kind of looks like a Mg deficiency but I'm not a 100 percent do you have it near a generator? Could be Ozone damage..

yeah test the ph of the soil. and then if the ph is around 6-7 than that probably isnt it. looks like it could just be that it needs nutes. i would start feeding it with a good vegging fert. something with a decent amount of nitrogen and potash. if you want you could mix 1/2 organic soil with 1/2 miracle grow soil than just transplant into somethin else later. i think thats the easiest way for your first time. everyone here will think i am crazy for recommending miracle grow soil, but i have a 8 ft plant outside that is in miracle grow soil. just be careful. it has time released nutes in it. so it wont need to be fed for a month maybe more. it really looks like it needs to be fed though.