PH in soil.

Hey guys, I have 3 plants in a pot of some crappy soil and I think its slowly taking a toll on them. They are prob 4.5 weeks into veg. I recently purchased some ffof and was curious if it would be safe to switch the soil out in hopes to promote their growth again. Thanks for the input.

Yeah get a larger container and treat it as a transplant, let recover a week or two before flowering. Best of luck!