I have two eheim eccos one of which i want to use on my new freshwater tank. will this filter create enough biological filtration on it's own? what else can i do to add good nitrifiers to my tank? live rock obviously doesn't work in a freshwater environment, but can the sand become live? any advice or opinions help, i'm new to this forum and somewhat new to fishkeeping. help me become the most responsible fishkeeper i can be!