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t5 high output is the way o go

check the pH. perhaps your locking out some nutrients. also you can never give a plant too much co2. and mac is right, only leaves should be exposed to co2

Check the pH. Too low of a pH and you run the risk of locking out the macronutrients especially nitrogen. I know for soil I am keeping mine around the 6.5 range. Not really sure about hydro but look into it.