Get rid of it fast. The worst part of green water is where you
leave it alone - as you've noticed fish don't care - and it
setles everywhere to the point where if you clean it up
it just comes back. That is for each piece of alage you see
there are 5 pieces you can't see hiding in rocks, gravel,
decorations etc.

I get rid of it by filtering the hell out of it with a diatom
filter, then stirrig up all the crud and repeating until thers
is no mess made by stirrig things up any more then I change 80%
of the water for two days then 50% per day for a week, then down
to 50% per week.

Flourish excel will kill it, but then you have a lot of dead algae
to deal with that rots and does you no good at all.

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