please help with plant problems! i got pics.

today i notice some problems with my plants. they all of some little rusty/redish spots on the leaves and some lite colord leaves. i dont know if its a Potassium (K) deficiency? or maybe a Calcium (CA) deficiency? i dont know please help!!! 4 days into flowering.

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Quote:

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Originally Posted by dejayou30

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i think i already found the problem, it looks like Cal/Mag deficienty?