Hi Guys, I have some weird spots on my basil plants that I cannot figure out what they are. Here is my setup:

Using tap water, PPM: 200

Flora Nova Grow: PPM:350

Total PPM: 550

PH: 6

Temp: 71

Using DWC system

Humidity: 40%

If you look at the plants in the front, you see two spots that look similar. I am not quite sure what they are.

If you look at the second picture, there is another spot which look different from the first PIC. The plant doesn't look that great and the leaf looks like its black dried.

All of these plants are in the same container.

PS: I don't think it is a Bacterial infection but it could be. Please share with me your opinions.