Ahhhhhhh!!! Nitrate!!

[reefwars]

Originally Posted by Proteus

Yeah I also dose biomate and have never seen a mulm build up. Though the stones are to absorb ammonia so I'm not sure how well they work if they have a layer of mulm

Eventually if left long enough most of it breaks under its own weight , although not very efficient if left that way. Biomate for sure helps as in your case