I've been battling ha for a while now. It seems to be more of a brown than green algae. Glad I'm not the only one. When I used chemiclean in the past, I noticed the ha was also affected. Not alot but a bit. Today I'm doing a few days of chemiclean to affect the ha a bit followed by Kent Tech M according to instructions elsewhere to bring the magnesium up to, I think, 1600 or 1800 ppm. I called J&L yesterday to figure out which kit test to that level. Going on memory, increasing by 100 per day is recommended until the required level and kept there for 2 weeks. I'll try and update here after the process and hopefully I'll be free of the stuff.
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