Canteloupe leaf issues on 1+ month old indoor plants - fungal issues, overwatering?


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My canteloupe seedlings have been off to an impressive start, growing quickly ever since planting them just over a month ago, but I've recently noticed some issues with the leaves per below pictures which I need help identifying.

I've had no damping off or any signs of overwatering up to this point, and I don't think these look like typical overwatering - maybe a fungal/bacterial disease? I'm wondering if there's something I'm doing that's causing stress and allowing a bacterial/fungal disease to take over - as in possibly too much water, over-fertilizing (diluted fish/seaweed liquid fertilizer). Does this looks like alternaria leaf spot and could that even occur indoors?

I've been watering by soaking plants in watering trays and have had a bad habit of occasionally letting plants sit in the tray soaking for a bit too long, but again I don't really think this looks like overwatering? I replace the water with each watering so the trays have fresh water every time, and I wash the trays with soap about once a week - hopefully this watering method isn't an opportunity for bacteria/fungus?

Edited to include a picture of the underside of a leaf.
 

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My canteloupe seedlings have been off to an impressive start, growing quickly ever since planting them just over a month ago, but I've recently noticed some issues with the leaves per below pictures which I need help identifying.

I've had no damping off or any signs of overwatering up to this point, and I don't think these look like typical overwatering - maybe a fungal/bacterial disease? I'm wondering if there's something I'm doing that's causing stress and allowing a bacterial/fungal disease to take over - as in possibly too much water, over-fertilizing (diluted fish/seaweed liquid fertilizer). Does this looks like alternaria leaf spot and could that even occur indoors?

I've been watering by soaking plants in watering trays and have had a bad habit of occasionally letting plants sit in the tray soaking for a bit too long, but again I don't really think this looks like overwatering? I replace the water with each watering so the trays have fresh water every time, and I wash the trays with soap about once a week - hopefully this watering method isn't an opportunity for bacteria/fungus?

Edited to include a picture of the underside of a leaf.
Hard to say for sure. Some of the pictures show what looks a lot like bacterial leaf spot but when the leaf is turned over and the bottom is shown it doesn't look like leaf spot but rather it looks like cabbage looper damage. It doesn't look like a watering issue at all. I presume that the yellow pictures are from lighting and not from chlorosis.
 

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