Definitely onset of magnesium deficiency. General hydroponics has cali magic, or calmag+ both work great though I prefer calimagic. U wont get what u need out of the flora trio.
Nothing wrong with it matey its just getting ready to pre-flower. Its the plants way of telling you its ready to go into flowering stage, those yellowing areas are where the bud sites will be.
Hi buddy :-) Without knowing how high your ec is, how much cal / may you give extra and how your watering behavior is, you can unfortunately not give any help :-) everything else would be absolutely advisable :-) please give more data :-)
Hello.. Hope u are well.. Yes tgat looks like magnesium deficiency.. Just add a small amount of magnesium sulphate or Epsom salts to ur regular fed or get a cal/mag solution and add as normal(id go a bit less than manufacture recommended amounts on bottle).. Stay safe n gud luck with her.. Hope she turns out well 4 u.. 👍🍀