What substrate is better?

[ooja3k]

it would need to be replaced??? whys that?

 

[Grins]

Here is what the distibutor says:

"To continue successful maintenance of your marine aquarium system, it is recommended that you add or exchange an appropriate amount of Miracle Mud@ (50%) every two years."

http://www.ecosystemaquarium.com/html/miracle_application.html