brown tip? on blue mystic 18 days old

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Did you check under a magnifying glass or hand scope?

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looks like nute burn or potassium def.
i would probably flush her, give her next feed just water and feed after that start on like half a mil or something then go up

yes checked under a magnifying glass. i bought some bug shit just incase. azamax. supposed to be the best the guy at my local hydro store said.