Is this light burn or something else?

Any help would be appreciated not sure if it’s light burn or a deficiency but tips are looking a bit pale / burnt. Got them under a 720w led but it’s dimmed to 250ws about 25 inches away and feeding them canna coco a&b about 1.0ec with the rhizotonic and cannazym once per week. 3rd image is on a different plant, leaf’s at bottom that’s probably something different.

They look light colored, like they are either too wet or hungry imo. I would immediately overfeed them

Roy O'Bannon said:

They look light colored, like they are either too wet or hungry imo. I would immediately overfeed them

Click to expand...

Thanks mate will give them a good feed in the morning come lights on and hopefully do the trick.