Brad,
now I dont know, but would it be a thing to put 2 pumps about 6 inches from your sand, and than put them on at least a 40 to 60 degree angle upwards,
I'm planning for my new tank as well, and as you know it would be in the 350 to 500 gal range, and proubably build out of epoxy, but still,
I was thinking of putting 3 low pointing up, and 3 ore 4 random (one left, one right and 2 from the back to front.
but maybe the upwards stream will give you more flow, without the shifting
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