Can someone tell me what this is please?

[DevinA95]

I have a 23 day old Mandarin autoflower that I just noticed this brown tip on one of the leaves. She was looking good this morning and didn't have that. Please help. I'm using happy frog soil with about 40% perlite and water about once a week. I just watered 2 days ago at a ph of 6.2 and about 1/2 teaspoon per gallon of fox farm trios Grow big. Last week I gave 1/3 teaspoon of grow big per gallon. I don't know whats wrong. Thanks to anyone in advance

 

[Anthem]

Brown tips is usually a sign of over feeding. But the rest of the plant looks to be fine, as in no brown tips. So it might just be that leaf rubbed against something. If you start to see more leaf tips browning you might want to back the nuts off some

 

[visajoe1]

NBD, move along

 

[growsince79]

You have every reason to worry. That plants a goner.

just kidding.

 

[DevinA95]

Thanks everyone. Was just wondering what it was and wanted to get a jump on it before it got worse.