Is this Nute burn?

Thanks guys! I’m growing in an already extended space bucket and the plant is currently about 9 inches away from the 150W UFO lamp I have. I won’t be able to raise it any higher I’m afraid. I’m currently on 1ml grow, 1ml top max and 3ml bloom per litre. I think I’ll just straight flush with ph balanced water tomorrow and start again with half the following feed.

Hi I'd say that looks exactly like a nutrient tip burn because it isn't spreading farther up the leaf like other problems would do. Sometimes light burn, heat stress and ph/root problems can do this but it will usually keep spreading further on the leaves. Check your lights heat, and also distance, if closer than 15 inches they may be getting that type of stress. You'll want to do a flush of plain ph water, then come in with a 1/4 dose feeding. How much of the bio grow are you using? 1ml? If all other possibilities are unlikely then lower the doses to 3/4 or 1/2 feedings and definitely alternate between feeding and plain water days to prevent buildup. Happy flowering. ✌️

I would also flush and start your new nute regiment....Cheers

Yes, very slightly. Do you remember to give them a break from nutrients every 3/4 waterings? Especially with the allmix soil.👍🌱