I would try and keep temps under 85 and humidity around 50-60% for veg. If you place a bowl of water or two in your closet it should raise your humidity. I personally prefer 18/6 over 24 cause it gives the plant time to rest which leaves you with a healthier plant IMO. What are you using for air circulation? The reason i ask is cause im thinking you are gonna need more light throughout your grow. More light =more heat. You are already at 88 so im thinking some kind of ventilation is gonna be a must.

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