Looks like a pair of dark green, healthy leaves to me. No burnt tips or margins = no N-tox.
Being that dark green could mean they are close to being burned or it's just the strain and dark green is normal for it. A month into flower you should be backing off on N a lot tho.
Dont have any good pics at the mo lights off now
But details are
Strain, berries (thats all i know) monster clones
Veg 63 days
Flower 29 days
Medium biobizz all mix (had 1 grow through it then reused with added potting soil)
1 600w hps light
120x120x180 tent
Temps are 26c
Monkey nutriants full line
Switched to bloom nutes 2 weeks back
Sorry for the crap pics
Use the flash to take a pic when the light is off. Not even worth looking at that one which is also a large file size for my slow internet connection.
You should be feeding with a bloom formula low on N so you begin seeing older fan leaves starting to yellow while the tops are still green and healthy. They like extra Mg and S in later flowering too so some Epsom Salts are good to add to the feed.
I'm not familiar with Biobizz or monkey nutes so can't help there.