since u said u are using ph perfect sensi ab read this. https://www.rollitup.org/dwc-bubbleponics/525004-need-advice-some-pros-brown.html
then refer to this. https://www.rollitup.org/dwc-bubbleponics/361430-dwc-root-slime-cure-aka.html
get the non-ph perfect sensi and brew some tea. see if...