Starting we have a 5’x5’x8’ tent , Kind k5 750 watt(all bulbs &fans in working order, 3 years old+) old exhaust still works, plenty of fans , need fresh air fan with damper, CO2 tent had a pouch to hold controller,added supplement lighting t5 leds without diffuser 20 gallon tank with circulating pump and supply pump installed with 4 -3”air stones, 25% nutrients TF 379ppm, reverse osmosis water 22ppm 7.3 ph after nutrients checked and adjusted ph to 5.7,what am I missing.