Hello dear members

i am a new member hear, i have a planted aquarium,
a carpet as a fertilizer,
120 ltr of tap water,
60w 10000 k & 40w 6500 k,
pHa carpet as a fertilizer,
120 ltr of tap water,
60w 10000 k & 40w 6500 k,
controller, co2 kit and a
UV Sterilizertow discus and about another 40 different tetras,
i have 2 questions please,
1- How to control the ph,kh and gh
2- is it ok to keep the co2 running at night because if i stop it after turning the lights off the ph raises from 6.8 to 7.8 at midnight, 8.4 at morning, and the plants needs a stabled ph all the time. what shall i do
i have 2 questions please,
1- How to control the ph,kh and gh
2- is it ok to keep the co2 running at night because if i stop it after turning the lights off the ph raises from 6.8 to 7.8 at midnight, 8.4 at morning, and the plants needs a stabled ph all the time. what shall i do