I honestly think you may not be able to dial 20s low enough. Im running the rw 20s on my tank on the lowest speed setting on a slow alternating pulse. Any higher and the sand at the edge of the tanks first 4-6 inches is non existent. I know its probably hard to believe but you really have to see first hand how much water these things move. I'm confident that two of the 15's would be more then ample. I tried the 15's and would have kept them but the magnets just wouldnt hold for me. For whatever reason the magents seemed to hold better on the 20s even though theyre rated for the same thickness.The overflow end of my tank is 15mm with 1/4" black acrylic. With my rw20s I've doubled up the magnets on the outside just as a bit of added grab. I
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300 Gal 6x3x28 high Starphire peninsula w/external herbie/bean animal hybrid +150 Gal custom sump with 30gal fuge section, (both built by Concept Aquariums Calgary), 3x Ecotech Radion xr30w g2's(soon to be G3 Pros), Jebao DCT 12000 return pump, 2x Jebao RW 20 powerheads, Tunze Ato, Vertex ro/di, Reef Octopus Ext 200 skimmer run internally.
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