Black Ciano

[OCDP]

Bah, cyano is no fun. I still get a bit of it now and then. Honestly, the mos efficient way to remove it, is to use airline tubing and siphon it out. Don't let any float around in the tank, be very careful of this, as you are trying to rid the system of it, and leaving leftovers isn't going to solve your problem.

Increase flow to the areas where cyano is growing most too, this helps. And I second the chemical advice, if all else fails, try the red slime remover, or chemiclean.