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First grow need help when to harvest..

Regarding that you somehow "ended up having something toxic" in your feed water, it looks more like nutrient excess (and/or nutrient lock-out from excess of other nutrients) or media/soil pH imbalance.

What water are you using; does it have high salts/ppm/EC; what media/soil; what feed and supplements at what dosages have you been using in this bloom phase? If using base nutes that require pH adjustment [seems outdated/legacy to me; there are good options for nutes that with good water don't need this, such as AN pH Perfect and MegaCrop], what do you adjust to and, perhaps the source of your problems, do you properly store and periodically calibrate your pH meter?
 
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