WH you see that one that is yellowing? What can be causing that These systems are a little bit a pain in the ass with all the hoses to move around with each pot I cut them all short and will repl W/ Bigger cuts when necessary. Cal Mag Grow Mirco Bloom Hydrozyme PPM's 1100. The smaller ones are Church they seem to be delicate The greener ones are Train Wreck strong as the best of them... Just hope no Herms