Co2 setup

I filled my 20 pohnd tank bought a regulator and a c02 laserdrilled tubing ring. Called co2 rainforest i think. I dont have money for a controller would 1.7pounds of pressure 19 hours a day be healthy? I have a ventilatiin system check out my journal if you need pics

the plant only use co2 when the light is on bro

I want 30 min before and after so they wake up in an enriched enviroment and start theure rest in an enriched enviromrnt.

actually i would wait till about 30 minutes into lights on cycle to start enriching... only when lights are on use it... let them wake up and get their stomata opened up nice to suck in the co2...