Definitely Nute burn coupled with the beginning stages of nitrogen Toxicity.
Take it easy on the nutes, use the bottles recommend dosage as the absolute max, so go half stregth for smaller plants. Dont worry they wont slow down growth infact it would help it!
Plants dont grow faster the more nutes you feed it.
i haven't been feeding with nutes at all lol
The plant is like 16 days old and an auto i started her off in a jiffy pellets then when i saw the roots grow through after maybe 4 days of sprout i transfered into biobizz all mix and have been feeding mineral water which is ph 7 the biobizz says their soil has a buffer to 7.3 and the mineral water is no more than ppm 250.
It would appear the all mix was a little hot but didn't show any symptoms until day 15 so i figured i was over watering then the tips started to turn a yellow so i started looking through leaf pictures and thought it was nute burn but well happy to have it confirmed mate so cheers for that.
i am currently still using mineral water onoy and watering when needed but until i see run off where as before i wasn't watering till i saw run off because i wanted the plant to use all the nutrients in the soil (i now realise this was stupid) lol but was told auto in all mix should last 4 to 5 weeks without nutes then start feeding at 1/4 strength but i didn't even get that far and she got nute burned to shit haha
oh well 1st grow small scale nothing lost just abit of time but i learnt from it, hopefully she will pull through..