World's Smallest Solo Cup Grow

DAY 86.LOSING FANS QUICK NOW..BEEN SOME GOOD PROGRESS ON THE BUDDING.GETING SOLID NOW..RED PISTOL TIPS NOW..ALMOST THERE.. I HOPE
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Light hitting warm water filled with a nutrient solution is always an equation for growth.... but not the kind of growth you're wanting to promote. Various forms of mold or fungus often grow in res's that are exposed to light.

Think of it as the old fire triangle... you remember... 3 things form the fire triangle... heat, air, and fuel.
Food, light, and heat form the bad-growth triangle that hydro growers should be wary of. The light leg of that triangle is the easiest to control.
 
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