For my 190g closed loop I use a Sequence Hammerhead pump and run it through an Ocean Motions 4 way. Coming out of the OM I then split each return 2 times for a total of 8 returns. This delivers, IMO, very nice random flow patterns. I use version 3 of the OM valve. In addition to this I use 2 X Tunze 6200 on a controller but admit that it is a bit of overkill so I do dial these back to probably 75%. HTH
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