Any Ideas?

I have a 400w cooltube setup... ffof from seed. I am not sure the exact day into flowering I am but I would say around day 21 from the plant. I have been pulling a few leaves off of my plant and have just been assuming it was just the nitrogen being used up in flowering... However it could be a little nuteburn... I just did my first 1/3 dose of big bloom and grow big... I also just started adding black strap to the mix yesterday... What do you guys think... is this nute burn or def?
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