Should the bioballs be 100% submerged in my sump?

  • We are currently upgrading MFK. thanks! -neo
I run 10 gallons of bioballs submerged, they work fine.
 
just drill a small hole just below the water lines on the return line so when the power goes off it breaks the siphon. you can add more oxygen to the bio balls by placing a air stone at the bottom of the pile .
 
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