The plant became over-pigmented this summer when it got more sun than it was used to. I had this one out on my balcony. The leaves all spotted purple like that, so I put it in a more protected/shaded area and they have since gone back to a solid green.
I flushed the media and plant with the spray hose of my kitchen sink, which produces a lot of bubbles as it runs through the media. Nothing has reappeared.
The dark green root is where it's coming in contact with the lava, which was providing moisture.
It's possible beneath the lava, the old roots are decomposing as they adjust to a change in media and this could be what created conditions for mould. The plant is doing well, growing a new leaf, but I'll keep an eye on the roots. I suspect they're not loving the lava as they all keep growing on top of it rather than diving down for moisture. They have healthy purple tips though, so they seem happy where they are.
Do spider mites like to live in the media?
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