i noticed something here as when I'm growing with nutes etc I had issues for so long with my plant either getting locked out or I thought overfeeding so for ages I would be taking them off the res and top feeding for a while and then putting them back on the res it nearly made me give up with them but low and behold I sussed what it was like in your pic I never used to use the plastic covers on the floats so I assume I was having ph rises and was always chasing my tail and it was that bro since realised a few months ago zero issues again
Yea thought I read something u posted about that m8... how does that happen?? Does the plastic cover not just keep the light out?? Is that the issue.. light exposed liquid?? Am a bit stoned atm lol but are you saying that no plastic cover on the aquavalve caused u ph issues m8???