I just finished a run with Algaefix marine to treat hair algae.
After the first dose i noticed a few micro stars dying, no change in algae
Second dose, all the micro stars were floating around the tank dying, my fish ate them as they floated by. Algae looked like it was dying off, I pulled it off the rocks which it pulled off easily.
Then the hair algae continued to grow
Added another dose, now my snails are missing. Algae seems the same.
Another dose and the algae pulled off again, but was still there and green.
Snails are dead, accept my nassuris snails, I guess because they were in the sand. My conch's are dead
Corals are fine, and the fish are fine
Algae is now more than ever
I performed my weekly 20% water changes while dosing with algae fix, and still ran my skimmer and carbon. I followed the directions properly, maybe even under dosing a little, but with the death of the micro stars and my snails I was not going to increase the dosage
My large brittle star is unharmed
Conclusion, this stuff is garbage and will kill some life forms, total waste of time