what do u prefer and why? i want to use either ceramic rings or ehfi-substrat pro in my xp3's.
are you saying thats what you use in your filter is those beads??Anyone notice the new "G-nodes" for the G3/G6 look exactly like the eheim substrat?
One thing I've started to notice is that it doesn't seem to really matter what you use for bio media...as long as it has a decent surface area, and you never clean it with tap water. Bacteria WILL grow on almost anything!
Case in point!