I don't use bottled nutes much at all because I put everything the plant needs into the soil mix but if your soil has no built in fertilizer then you def need them. My initial concern was that your soil medium (if your using something like fox farm bagged soil) might contain ferts in addition to what your feeding it, in which case over feeding will likely occur if you don't compensate by lowering your amount of nutes accordingly.
The plant doesn't look too bad though so I don't think it will be too hard to correct.
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