I just finished harvesting 3 plants. I'm very dissapointed with the yield, got 8 grams from 1 plant and 4 from another. Only got good yield from one plant. My question is , what could be the reason for low yield, light or problems with the plant. I had over watering problems with them when they were seedlings. I have 2x4 tent and were using a Mars Hydro 900.