this is my first hydro grow, and i didnt have an EC/PPM meter until a week or 2 ago. my EC was WAY too high, so thats the only stress factor i could think of happening. now that i have a truncheon EC/PPM meter, i feel a lot more comfortable. i have way more control. i picked off every pollen sack i could find. they popped up over night, so they didnt have time to fill up with pollen. i probably missed some, but i did what i could. i only have 2 plants going right now, and the doctor is too big and ridiculous and healthy to get rid of just because it threw out some pollen sacks.