cool lima Broc.
I would think that matrix, biomax, or substrate pro would have allot more surface area for the bacteria. What is the difference between eheim mech (ceramic rings) and the substrate pro ? I can believe how much of that stuff came with the 2217
I would think that matrix, biomax, or substrate pro would have allot more surface area for the bacteria. What is the difference between eheim mech (ceramic rings) and the substrate pro ? I can believe how much of that stuff came with the 2217
