benefits/liabilities of eco-system filters

[kindaobsessed]

this seems kinda intriguing since it states you don't need a skimmer. what's miracle mud, how available is it, and how costly is it?

 

[symbiont04]

http://www.ipsf.com/#anchor273215 for an idea, but ive never orderd from there, so i would be a little cautious, its kinda a cheap site.