Help with yellowing leaves

[Jaden4306]

I'm a new grower growing alien gorilla glue in happy frog soil in 3 gallon pots watering 3/4 of a gallon of water with Lotus nutrients every 4 to 5 days. I feed nutrients every other watering. I have a Vista Spectra p2000 about 26 inches above the canopy in 2x2 tent. My soil pH is 6.8. temperature between 71 to 75 with humidity around 64 to 70%. I would appreciate any thoughts on why my plants are turning light green. Could it be a magnesium issue or something else?

[Rwise]

Could be an uptake issue from the high PH, in veg for soil run 6.2-6.5 then in flower run 6.5-6.8.

[Jaden4306]

What's the best way to lower the soil's pH?

[Gator]

Flush with pH water,6.4 should work then give them a compost tea, let the water sit overnight first

[Bluey]

If they are still in veg and losing pigment, going from dark to light green, I'd say your soil is running low in N.

Perhaps give veg nutes every watering now until flip and then transition to flower nutes over a couple of weeks once the stretch has done its thing.

The compost tea is a good idea or a top dressing.

If the 3 of them are staying in that tent you better flip now.

[Jaden4306]

Will it be ok to flip them even though they are about 4 1/2 weeks? I don't wanna flip to early. I can probably move one to a closet when I flip.

[Bluey]

As long as you can control your environment well, and have enough light, sure, keep em going. 4.5 weeks in veg is enough to get decent potent buds but if you can let them go longer and not run out of room you'll get a better result all round.

[Jaden4306]

I think I'll try going another week or two and then flip. Thanks for the insight. I could use all the help I can get. I still got more to learn about watering and feeding and watching for different deficiencies. It takes time I guess.