01-19-2005, 10:18 AM
Join Date: Feb 2004
Location: Lomita, CA
iTrader Positive Rating: 100%
It is an inert biological media..it has no affects what-so-ever on your parameters, nor on your micros/macros. What you might have in mind is carbon, which does take out nutrients from your water.
If you can, get EHFISUBSTRAT PRO..it's better in that you don't need to change 1/3rd of it every year due to pore clogging.