Ditch the bioballs and install a RPD refugium instead. Bioballs are a nitrate factory and also get clogged up with detritus which can crash a tank if they are neglected for any real length of time.
Steve My Old 180G Mixed Reef Currently: 120G Wavefront Mixed 29G Seahorse & Softies Running ReefAngel Plus x2 435-8
Bioball have a place in the reef aquarium but not in a wet / dry sump.
People use bioballs to raise copepods and amphipods. There are a couple threads that guys on RC use them in 5 gallon buckets to grow food for their seahorses and such. For a reef it traps detritus and reduces flow so it grows hair algae and cyano.
You can still use the sump and a sump to house extra live rock or as a refugium.
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