18x10x10, lights vented with intake/exhaust, fresh air intake 24hr. carbon filter exhaust 24 hr. temp 75 inside...80 outside...RH 44%...Co2 15 min every 3 hrs...fans off...feeding 1300 ppms 4x on 6, 10, 6, 10 min schd. ph at 5.8 RO water. airstones in the tank, water temp 67.7...what can cause...