BANANA PURPLE PUNCH AUTO

The spot doesn't look like a problem to me. Can't see too well, but possibly from a little drop on the leaf that burned. It doesn't look like nutrient burn and excess N the leaves would be very dark. On the leaf below it looks like you have a thrip though, they aren't too much trouble, but would not let them get too comfortable.

Over and under watering can look almost the same and its good to note how to spot the differences. They both will have faded wilty leaves, the "stem" or better known as the petiole that is connecting the leaf to the main plant is how we tell, It will be flaccid/bendy/weak in underwatered plants and ridged/stiff/hard in overwatering. With this in mind plants can be easily overwatered if the medium is holding onto to much and is not draining fats enough. The solution is watering with less more frequently. Its a hard concept to get if you used to overwatering. I have done this a lot in my grows. Mostly I grow outside and I need to overwater my plants or they will die midday as the sun heats up all my balcony pots and plants. when I'm indoors this is not the case and a hard habit to break. Best Of Luck! ***disclaimer, multiple people are answering all questions as there is a contest called GOTM, when a user is selected as the answer they get a point. Please see the contest page for information regarding the details: growdiaries.com/giveaways/GotM-August-2022 Please note, when you reply to anything on the questions part of Growdiaries website, no one will be notified of this. Not even if you use a "@" tag in their name. Best to reach out to them in DM using your inbox, it can be found in the bottom right hand corner of the site. It's the small paper airplane button, it will be highlighted green if you have new messages***