Oct 5, 2011 #1 40galreef Aquarium Advice Activist Joined Sep 12, 2011 Messages 173 I am looking a different sump designs, and am wondering if bio balls are effective fully underwater?
Oct 5, 2011 #2 Gregcoyote Aquarium Advice Addict Joined Feb 12, 2011 Messages 8,423 Location Columbia, Missouri No. They support aerobic bacteria mostly and there is a debate as to their worth at all.
Oct 6, 2011 #3 AquaRick Aquarium Advice Addict Joined Sep 3, 2011 Messages 2,638 Location Northern CA I would just add some live rock rubble to your sump. LR + good circulation = best filter for SW tanks.
I would just add some live rock rubble to your sump. LR + good circulation = best filter for SW tanks.