Possible nutrient deficiency

Hi guys I’ve just stated getting a few marks like this coming up on some of top leaves of my plants not quite sure what it is ? Any ideas would be appreciated?

Looks like nutrient and or pH burn is all. Buds look great.
A picture taken under white light instead of the LEDs would help you get a better answer.

I’m running a rdwc system the ph has been pretty steady at 6.0 and ec around 0.90
Following my nutrient chart. I’ve put about 0.5ml of cal mag in also. It kinda looks like a calcium deficiency but I’m quite new to this so I’d thought I’d ask on here . I’ll try get some better pictures later when the light is back on but thanks for the responce anyways bro !

Here’s a some better pictures.....

Nope. Lol not better pictures! No gold star for you today.

Ahh damn lol . There the best I can get that was with the leds turned off . Still no idea then ?
maybe it’s just got corona

Your buds look great dude. Are they sticky and stinky? Good thing you keep a watchful eye on them. I would not take corrective action yet looking so nice. But keep watching and looking sometimes a nute problem can emerge in a week.