flow to carbon should be around 400-600 GPH and flow to GFO should be around 200-400 GPH....personally Ive only ever used "Rowaphos" and its supposed to look like boiling water when it has proper flow, so definitely not aggressively tumbling....cant speak for other kinds/brands of GFO
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260g mixed reef, 105g sump, water blaster 7000 return, Bubble King SM 300 skimmer, Aqua Controller Jr, 4 radions, 3 Tunze 6055s,1 tunze 6065, 2 Vortech MP40s, Vortech MP20, Tunze ATO, GHL SA2 doser, 2 TLF reactors (1 carbon, 1 rowa). http://www.canreef.com/vbulletin/showthread.php?t=50034 . Tank Video here http://www.vimeo.com/2304609 and here http://www.vimeo.com/16591694
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