~ jan JJsPond.us wrote:

If it is true string algae it will form a mat at the surface, at which time
it is called "blanket weed". That is when it should be lifted out, imo.

I lift out the blanket weed until it gets full of snails. Then, I think
it is better to not loose the snails and let them dispose of the blanket
weed. It works for me.
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Cheers, Steve Henning in Reading, PA USA