Flowering Deficiency

This is the first sign of deficiency I have had since flowering. they are about 5 weeks into flowering. All the leaves around the bud are turning yellow and crisping up. Also, they are curling up from the sides. I flushed them with plain PH'ed water about 2 days ago, hoping to wash away any kind of nutrient lockout that it might of developed. it's twin has no deficiencies. Thoughts?

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