Rusty spots developing on two leaves on one plant.

I am growing 3 Banana Bomb and 1 Cement Shoes plant in coots organic mix soil I mixed up from seed:

My soil consists of:
1/3rd Medium Perlite,
1/3 Sphagnum Peat Moss
1/6 Malibu Compost
1/6 Wiggle Worm Pure Worm Castings
Malted Barley
Crustacean Meal
Kelp Meal
Neem Cake
Karanja Cake
Basalt
Gypsum
Oyster Shell Flour

Anyways the Banana Bomb plants are 5 weeks old, Cement Shoes 4 weeks and all in veg. Only one of the Banana Bomb is currently affected and only 2 leaves. The rest seem to be doing fine. I have 2 LED lights about 20 to 22 inches above them in a 3x3x7 grow tent, each light is 180 true watts. I keep the humidity between 57 and 60% and temps between 69F at lights off up to 78F when on. I topped them 3 days ago when they were about 12 inches tall, and when I did I mixed up my normal water and some premixed water with neem and ended up hitting them while lights were on for a few hours. The water it was in dried pretty quickly however. They were a lil droopy, but in 3 days sprung back and look really happy and much better than before and are now already nearly as tall as they were before.

I saw some gnats or fruit flies, so I started to water with some BTi solution. It looks more and more like it is fruit flies from the kitchen that made their way to my tent (red eyes/red/orange body). I have yellow sticky cards on the way to snag the 1 or 2 in the tent to ensure proper identification. I used a compost tea about a week ago. Other than that I have only been using water and molasses. I started out by using absorbic acid (vit c) to adjust my PH because it is like 8.5 out of the tap, but ended up deciding to go with the general rule that organic soil doesn't need its water to be adjusted if amended properly. I noticed these spots today on two leaves of one of my four plants...

I felt like pictures of cannabis septoria looked like the issue at first, but now I am of course confused as there could be many answers. I think I may go back to PH adjusting my water anyway with citric acid and potassium bicarbonate, just to eliminate any potential issues that could cause in regards to soil drift or nute lockout (regardless of how small a chance that may be it). I have admittingly sprayed/wet the leaves of the plants more times than I should for little to no reason and I plan to stop this, it is hard sometimes when using a sprayer to water not to mist them a little though. Anyone with any questions or thoughts? Should I remove these leaves? Leave them alone and monitor if it spreads? I s'pose I also need to bust out a loop and inspect leaves for critters too, but examining them with naked eye I have not seen anything.

PS Sorry for the blurple... I have done my best adjusting the pics/using a flash to accurately show the color of the close up of the leaves in question.

Grow diary link here: https://growdiaries.com/diaries/78303-bomb-seeds-banana-bomb-grow-journal-by-gomicao

My 2c would be either they got wet while watering and those are a few burn spots, or a bit or calcium def in those. If just a few leaves I would watch very close to see if any others become affected. If so, it is a cal def imo, otherwise leave it be.

It may well be from the lack of ph adjustment, although getting cal out of whack isnt that easy...but yes ph your water, every time imo.

ComfortCreator said:

My 2c would be either they got wet while watering and those are a few burn spots, or a bit or calcium def in those. If just a few leaves I would watch very close to see if any others become affected. If so, it is a cal def imo, otherwise leave it be.

It may well be from the lack of ph adjustment, although getting cal out of whack isnt that easy...but yes ph your water, every time imo.

Click to expand...

Someone else mentioned Calcium on another forum, I hope that is all it ends up being (if even that). I need to either top dress my soil in the next day or two, or get some cal/mag and give them a light dose. That would mean my soil mix will have to be changed up a bit next time and/or plan for this with the current mix. I will wait a few days and see if it stays where it is at or moves anywhere else. Or if any other plants show the same.