Nothing to do with co2.
What is your run-off pH?..........this may explain some things............but it looks like an insect infestation combined with a nutrition issue.
Also, never grow at 24/0..... all plants NEED sleep........18/6 is optimal.
Plants stressed by growing at 24/0 are more easily attacked by insects and/or suffer health issues.
Using only 1 product with a pH of 4.4 (wtf) is also going to cause massive problems.
Your plants need a N/P/K fertilizer too, not just a highly acidic root booster.