|| I was using DIY CO2, but have disconnected it as it only seems to
|| encourage the algae.

This is exactly the 'cause' of it... I know... it's hard to believe... but
true...

|| I have been reading about treating the plants using a 5% bleach
|| solution and realise the trauma this must cause the plant, but I am
|| desperate.

Yep, I learned that the hard way too... bleach is the only thing that
'really' worked...

|| The only thing I haven't been able to find on the subject is whether
|| the dead algae falls off or whether it persists on the leaves and
|| needs removal. Does anyone have any views?
||
|| Thanks!

FWIW, I too asked this question about a hundred times... and Tom Barr would
always answer, CO2 2 low... until I learned how to measure my kH and pH to
get my CO2 levels, I had all types of algae... but I learned.... it's
better to have the upper limit than the lower limit... DIY barely puts out
enough to get you to the upper limit... Keep it up and chugging and your
algae might just vanish....

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