What deficiency / excess is this?

Tip burn is fine and 100% normal. But in this case. It's just overfed. It's not at the stage where it's clawing right? "Sides canoeing up". Your substrate is either too toxic/salts and needs to be flushed. As it looks like nute burn followed closely is nute lock. Flush and restart the programme. (When I say flush, if it's soil. You don't want run-off, just regular water feeds with cal mag for a week and the remaining nutrients in the soil will be the fees) To check if it's nutrient lock though you will need to hard flush, (run off needed) base line your water. So take the PPM of the water. Pour 2l on her catch all the run off if it's soil make sure to drain her right and lift her up turn her to the side and catch the run-off. Grab a ppm test and if it's higher than your last feed. So if it's say 2500 and your water flush was 200ppm take 200 off from 2500 and that means your sub is loaded with nutrients. If you have your ppm from y9ur last feed if it's below that by 3-700ppm She a feeding and it's just straight nute burn. Or if it's above your feed from last time. Continue with more hard flushing till you get that ppm number down. Feel free 2 DM me for more details. Good luck bro.