Quick question about bio balls
I've been noticing that when bio balls have been used in a sump tank that they are always suspended above the water line and the water flows through them. I've never seen the balls submersed in water. Is there any reason for that?
I am curios because I recently received a brand new Fluval 404 & a 403 and was thinking about filling the tub with Bio balls instead of the filter elements that come with them. Sounds weird but its all put of the master plan.
What do you think?
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