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Hydrogen Sulphide and algae?

I just did my weekly water change, and a major plant prune because they 
were taking over the tank again (g), and I'd promised some cuttings to a 

While pruning willow hygrophila, I disturbed the gravel near my large 
Aponogeton and got a whiff of rotten eggs. I dug around in the substrate 
and found that the bulb had split and was rotting, so I removed the plant 
and all the pieces of the bulb I could find.

What I had noticed earlier was that I had some stubborn green algae on 
the front glass, not the usual algae I get in small quantities, and that 
there was a little more beard algae than normal (I always have a little, 
but it's slowly disappearing now - there wasn't much, just more than I 
expected to find given the way the tank and the algae are going).

That brings me to my question. Does anyone know if some sorts of algae 
are dependent on, or encouraged by, hydrogen sulphide? Another 
possibility would be that some algae might be inhibited by a higher redox 
potential, but could get a spurt at times when a lot of decomposition is 
going on in the tank and redox levels fall.

Any comments/answers from out there?

David Aiken