Beautiful tank! And aquascape. That doesn't look crowded at all.
In the manual, Ecotech state that you need 4 pumps to create gyre flow. I think that would get expensive/crowded/ugly quite quickly. Putting 4 pumps in that tank would ruin the otherwise lovely aesthetics I think...
Mark's "pseudo-gyre" flow sounds like a good idea. No harm in trying it... see how the flow looks in your tank.
-droog
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