redish substance covering LR and starting to get on the subs

[RubixCube]

I am cycling a 77 gal tank now that is about half way through a cycle. (Ammonia is down and nitrites are up.) Ever since my LR has gone through the die-off process, its seems to be covered in this reddish substance, has the look and colour of cayenne pepper. Is this cyano? How can I get rid of it? The only livestock I have in the tank is 6 zebra hermits. Thanks

 

[biotoxin]

probably is. Look in this forum for Red Slime i wrote exactly how to get rid of it in there. 10 steps