well I got my eheim 2260 and it is flippin huge!! but anyways I bought ehfimec, ehfisynth, and ehfifix. Do I really need to get the substrat for my biological? It is so freakin expensive I would rather use something else if possible. this is for my 125 right now which already has 2 penguin 400's. Just curios if not I guess I'll just have to shell out another 30-50 dollars
Thanks in advance
Thanks in advance