with enough LR, you don't need any bioballs and could really use anything for a sump. I use a 20 gal tank with a DIY dividerto help with microbubbles. I have my berlin skimmer, a mag5 and a mag7 in about 15 gal of water.
Works good for me. I have about 110lbs or LR in my 75 gal tank wit ha 4" DSB.
HTH
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*180 gal Display, 100 gal basement sump, 33 gal refugium, 3x250 MH, 2x160 VHO actinics, zoos, some softies, LPS & lots of acros and other SPS.
*100 gal prop tank plumbed into main system w/ 2x96 PC lights and 1x150 MH,
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