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Although my golden barbs destroy any hydrocotyle that they can find. I'd probably still put money on the SAE.

So long as it sinks, drop it where you want it.

That's most likely related to iron dosing as the pigment is likely to be an iron oxide from firing the clay.

Not an aquatic study, but something I came across recently when reading around the subject of light frequencies after reading a tread on here. Does support your initial theory on pH to a degree. BMC Plant Biology | Full text | Light-induced morphological alteration in anthocyanin-accumulating...

No, I can't, but they do do this. I'm sure there is a perfectly reasonable explanation with regards to their natural environment or the way that the growth sections form relative to each other that explains this, but I don't know what it is.

Yup, I get lots of leaves like this in my non-CO2 tanks if I put hairgrass in them, they're definitely not calcium deficient.

Turns out, after the whole controversy, that I like horse, it's very tasty.