AsNoriuanswered grow question 2 years ago What if your tap water was acidic already ????
Lemon dont work, it fools you, in 30 min same ph as it was before
Ph +- cost pennies last long.
Ph pen cost a lot if good, but you can always buy aquarium ph drops, cheapest way to check
You plants are sad. Very sad. Without ph you will grow shit.
Plus you have either too hot soil or already feeding them ...
Read even smallest article about growing weed, you really need it.