Cause i acidently overshot to 4 and had to corect it to 5.6 and I dunno if that is bad for the water.
It's not great, but I wouldn't worry about it too much. Better to have the proper PH. Just try not to overshoot too many times. Good luck.
I have done it before, maybe not the best thing in the world but my plants are doing ok, I wacked the PH down below 4 and then nudged it up to 6.
premix ur feeds in a bucket - never add neat nutes to soil or hydro. especially nevvvver add neat ph stabiliser to soil or hydro! ph- on dry soil can cause fire lol be carefull. mix it up separately 1st then u know exactly what ur plants are getting without up down up down up down...................