Yeah, that's it, the calmag+. I thought the + meant it had iron in it...I've also been letting my ppm get way too high. My first dwc I grew this crazy giant mbap, i kept raising the ppm higher and higher, it just ate everything and turned into a tree. I did the same thing my second run, but it didn't work out that the same. I'm tracking and adjusting ppm now, we'll see if I have these problems still, I bet that was it. It was probably dissolving or killing some of the roots and clogging it. Maybe. It could just been the noots accumulating. I tried that power head but there's no good way to keep it at the water level, it needs to be submerged and right on the surface. I think it'll probably be ok now that I'm keeping ppm stable. Here's the mbap monster...it was like 5 cubic feet by day 50, made me think ppm adjustment was for suckers lol
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