I have dosed twice with Alagefix Marine, with my algae at about the stage of your pics, I have been battling this pest for 4 months and finally realized that it could be the storage of my R/O water. I have a 80 gallon storage tank which has an automatic refill from the R/O unit. With using only about 6 gallons a week, so contamination is a problem. I have now discarded all the stored water and only making enough R/O water to last the week. I will continue the Alagefix Marine dosage to clear the problem hoping it works.
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