Yellow tips on bottom leaves

Noticed these tips on the bottom leaves this evening…Any leaf readers around? All the other plants in the tent are about a week younger and don’t seem to have anything similar going on.
It’s in OF/HF/EWC/Compost w/perlite&pumice
Temps in the tent are 80-83, RH: 48. It’s day 12 of a Fastbuds AUTO AK. I’ve been watering everyone together and the last time I watered was yesterday afternoon. It’s my first grow…
Thanks

close ups of each

Some strains react differently in the same environment. It happens. The additional ingredients you added to soil is good, may have caused this, but nothing to worry. It will grow out of it. New growth is key, it looks great. Good job

Thanks @visajoe1