Maybe I missed it, do you run your drip water through carbon filters or is it well water? If carbon, did you let it go longer than normal...or possibly bad batch of filters?? Flowers are so doggone sensitive!
Most drip systems have 3 chambers if not add a 3rd or fourth and put a back up carbon block in just incase . I use a 3 chamber drip with 2 carbon blocks that runs all my tanks but it's spliced into a 4 th steperate chamber with a 3rd carbon block just for my flowers tank. Also use a ro with 2 carbon blocks for that tank. Just add back ups the second one will last a year because it will never see chlorine .