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@August_West, yeah, I believe hydroguard will solve your issue. I also ordered it, but I don't live in the US and shipping has been a pain in the a.....in the meanwhile, I submerged roots under H2O2 @ 3% for an hour, painted reservoirs (they were kinda translucid), and added a new air pump, as the one I had was unsufficient for my setup. Water temp was fine. After that healthy new roots started growing from old ones and plants are growing nicely. Looks like in your case hydroguard will be sufficient. Hope your plants recover. Happy grow !!