Warning- bad carbon will kill

[my2rotties]

I don't have corals but have been using the stuff for a month with no ill effect on anything. I honestly thought it works fantastic. The only thing I have noticed since using it is diatoms, which prob have nothing to do with the carbon. I never had an issue with them before.

I do see little rust spots in my reactor though, but maybe two or three little tiny pieces.

[blueyota]

I also have a small diatom breakout in my sand since using it so maybe it is linked together??