Oops, thanks for pointing that out.
Anyway, on a 70 gallon 3'-long tank the most economical Tunze option would be one 6055 Nanostream with a single controller. The price would be almost identical to a Vortech MP20 and once you do a 2-minute mod to the shroud, output will almost be identical as well.
Smart placement of the 6055 and your live rock would be key. Having a Gyre setup (think a whirlpool) leaving some open space around all sides of the live rock would be perfect.
I ran a 6-foot long (~120 gallon) mixed reef with nothing but an old Tunze 6000 Stream (which doesn't have much more output than a 6055) and about 400 gph from my return pump in a Gyre setup.
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