Yellow leaf 2 week old

Okay so i have a 8 site dwc i made with a 18gal tote i have about 15gal of watter in there with probly about 1/5th the recomended feeding schedual im using advance nutriants ph perfect 3 part system my lights a kessil h380 led and this is all in my 4x2 tent

Okay so my leafs started looking ehhhhh yesterday then i checked and ph was at a 6.5 so this morning i dropped it to a 5.7 btw i know i wasnt supposed to feed my plants but its already in the res and there allready at 2 weeks the ec is at a .7 and water trmps a solid 70-74 also my tent goes from 72-80f all day usualy more in the 75-80 range till i open the tent

So i checked my ph 12 hours later after yesterday and it went from a 5.7 to a 6.3 ia that normal or should i try investigating a new plastic tote for my dwc

Everything is OK - are you feeding it nutrients? what about air circulation (air should be replaced every 30 seconds or so. how close to light is plant? not letting it get dry, right?

Yeah i put nutes in after a week by accedint i didnt know it was supposed to be 2 weeks i dont really have much circulation besides a fan in there its in a closet but i do open her up 2 or 3 times a day at least about 12 apart each and my lights a h380 its only hot at like 1 foot away but i moved my light all the way up not because its so bright and intense but i would say its now about 3 or 4 feet away and no there not really getting dry but some leafes are a little crisp