I had a serious outbreak of cyano
a couple of months ago and am just sharing this for info purposes since I was later told by a number of people that it isn't recommended. I was getting sick of fighting it like it sounds that you are so this is what I did. My tank is a 50 gallon, mainly a FOWLR
with the exception of having a few mushrooms and a condy anemone. I would siphon out as much of the cyano
as I could. It was easy to remove since it would come away from the sand and rocks in sheets. This did almost no good because with just a couple hours of light it would come back just like before.
Next I added more powerheads. I had one chopping up the surface, and 3 aimed down around the rocks to eliminate as many dead spots as possible. I had some success with this. It slowed the growth way down as it didn't allow it to grow in sheets anymore. It was still there though.
Finally, I had a friend tell me how he had used the Red Slime Remover to get rid of his. I guess this is the "not recommended" part. He let me use his as he had plenty left. I pulled all charcoal, turned my skimmer off, and followed the directions with it. After 48 hours I didn't have a trace of cyano
left in my tank and it hasn't come back in the last couple of months.
I did get some small ammonia and nitrite levels a few days after using it, so it did have some effects on my biofiltration, but did not harm any of my livestock. I saw that initially you said you tried red slime remover and it did nothing. Not sure if maybe you have so much of it that it couldn't do the job, or if maybe what you have isn't cyano
, but that stuff made an immediate dent in mine. It could have also been that I had knocked mine back with the mechanical method enough so that the red slime remover could finish it off.