Should I be concerned. Two top leaves have tinny yellow tips. I just started feeding her (White Widows) yesterday. im on the 4th week of veg. Nutrients- Grow big and Big Bloom. 5m each into 1 gallon ph 7. Next feed Cal-Meg.
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No. They look great actually. If the tips turn brown it is probably the start of nutrient burn. As long as it doesn't spread to the serrations you are fine.