I think there was a miscommunication, there's no water on the plant... It's just that the air is too moist, keeping the base of the plants always moist, and also the roots too moist, which lead to decay of the root systems.
I'm not sure what contributed to the outbreak of mold, because everything seemed to be doing very well for a few weeks (paphs) and then started going down hill when the fuzzy mold started in. It's such a small environment that it's easy to have everything to change drastically.
I'm not sure I understand how it can not be too wet. Doesn't mold grow when moisture + nutrients exist? Or does mold only grow on algae byproducts which are decomposing? I can't say I've ever seen mold grow in a fertilizer... I know you say that Algae is harmless, but I'm going to have to disagree if it's creating byproducts which mold is growing on, and encouraging... I may be wrong in this direction, but the algae is thick enough that it's blocking regular water movement when flushing. Before when the medium was clean and clear, it wasn't a problem, but as soon as it started to get infected with algae, and creating by products, is when everything seems to have started to go wrong.
Just my thoughts and observations, I'm not blaming the hydrocoton media, I've used it successfully often, just never with clear pots, which I may try switching to opaque pots after cleaning the plants up.
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