Another option for siphoning out the algae is to hook up a large 7" filter sock to your sump and siphon directly into the sock. This way you can siphon for an hour or more and not have to worry about replacing the water you have removed.
When I had a bad algae problem that is what I did and it was so easy to completely clean all the rocks, the gravel and the glass a couple times a week. Eventually you can win this battle. Your water is fine you just have to get the algae under control.
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