I wish I had googled before I used AlgaeFix. I killed about 10 fish with it using the full dosage.
I have continued using it at half dosage but the fish seem to dislike it (you can tell when they taste it in the water they go crazy) and it doesn't get rid of the ugly black algaes in my experience. I am thinking of throwing in the towel on this chemical band-aid.
Sorry to hear man. I used reccomended as well, but i didn't get any fish loss. Not even my inverts died. And yea, red algaes like BBA arent affected at all. It works well against green algaes like spiro and clado.