Why The Heck Do I Still Have Red Slime Algea?!

[Lance]

I've found cyano to pop up now and again for no apparent reason. Many reefers will tell you the same thing. When I get an outbreak of it I deal with it ASAP before it gets a real toe hold. Siphon out what you can, and it usually goes away. For persistent cyano Red Slime remover does work remarkably well.

[Northernseacorals]

Ditto with the ChemiClean, I would not bother wasting your precious time trying to figure out why you have it, better to eradicate it from your tank and keep all your levels in check as best you can for the future mate.