Oct 2, 2012 #1 diana55 Aquarium Advice Newbie Joined Sep 17, 2012 Messages 4 I've never used one and so far I have been lucky !!! Should I be using one ?
Oct 2, 2012 #2 sammo2001 Aquarium Advice Regular Joined Sep 18, 2012 Messages 63 Location Darwin, Australia Most definitely!!!