unhappy seedling??

hi everyone strain is black dominax dark plasma. everything was fine up to recently waterings have been here n there i wait till cup is light as can be without the plant drooping. noticed that its not as perky now plant has a slight droop to it. no idea what it could be. plant is about a month old ina cup off ffof with about 30% vulcanite. waters always phd around 6.5 or so

Definitely root bound, time for a replant. The plant has also used up the nutrients in the FF soil.

Looks like it needs water. Suggest you bottom water so you can be sure the soil has not gone over dry, which will make the soil hydroscopic so it sheds water. Dry soil also shrinks so much of your watering can run right down the side of the cup and out the bottom. Obviously if your cups are heavy in those pictures, my advice is wrong. It is a good time to pot up and that will provide all fresh nutrients, so no need to feed additional.

transplanted, happy the next day, only thing i will add is roots didnt seem to be as full as i thought they'd before a plant that is “root bound”.