Cutting the water may be ok. That's the great thing about hydro. You can adjust quickly. If it doesn't work put the water back to them.

Sorry about the cooling unit. I looked again and it is an evaporative cooler which means it evaporates water to cool and is a humidifier not a dehumidifier. Big difference. Look into it more.

I'm mid east coast and a dehumidifier will just barely keep it down under 40 percent.