can any 1 heip

as ucan see the 1st 2fan leaves r nt well, the saged dwn at the end and went a darker green than rest of plant and yellow spots started follewed by brown allround yellow spots! 1st 1wks of veg rh was 20% and temp is allways 75, untill i noticed the 1st to leaves goin dry and sagging, so i raised up rh up to 50%, ppm always been low at blow 400, aswel as ph always gud, its nw day18 and the next 2big fan leaves are goin the same? plz let me knw if u no any advice 4me!! o an i have the plant on 24hr! dwc 20liter single pot

Sounds like nute burn whats your ppm?

no dnt tink it is cus it always been low below 300, but i mve it up to 450 2day, wud it hav anyting 2 do wit da water level, it was below pot about 2inchs and da clay pebbles wer vry dry luk frm hlf way up pot?

also im using a liquid ph testing kit clour chart, mybe tis is the problm, are thy acurcte test??

might need to recalbrate your ph tester