No, mulm is pretty much detritus and sloughed off dead bacteria that you're better off removing. This can smother and impede younger more active bacteria colonies.
That said don't confuse it with bacteria colonies in general. Being too clean and impede their growth or shear them off of surfaces.
In a typical RAS beneficial bacteria is growing on all surfaces. It's said up to 30 percent is on the tank walls, pipes, etc.
One of the advantages of moving bacteria filters that have media constantly in motion is the rubbing together removed the older and dead bacteria that grows on the outside of the media. This allows the new younger and more efficient bacteria to flourish.
Last edited by Bill Cody; 02/09/16 04:10 PM. Reason: spell edit
