cbster AC Members Nov 16, 2003 388 0 16 57 Freeburg, IL May 21, 2005 #1 If you add substrate on top of existing substrate does that bother the beneficial bacteria? I don't use a under gravel filter if that makes a difference with water moving through the gravel.
If you add substrate on top of existing substrate does that bother the beneficial bacteria? I don't use a under gravel filter if that makes a difference with water moving through the gravel.
