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See, that's the thing that is dependant on many other variables. You need to decide how many output nozzles you will have first, as well as the diameter of each nozzle. If you used a Mak4 that puts out roughly 1200 GPH though a 1" return line, and you 6 nozzles should get 200 GPH per nozzle. If you reduce your nozzle diamter to 3/4" then you effectively have more force of water pressure coming out of each nozzle, but still maintain about 200 GPH out of each. This would change your flow style though, much like the difference between a maxi-jet and a koralia.
As with so many things in this hobby, I would buy a bigger pump than you might need. It saves you from having to upgrade later.
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THE BARQUARIUM:
55 gallon cube - 50 lbs LR - ASM G3 skimmer - 30 Gallon sump - 22 Gallon refugium / frag tank - 4x 24 watt HO T5's - Mag 9.5 return - Pin Point PH monitor - 400 watt XM 20K MH in Lumenarc reflector - Dual stage GFO/NO3 media reactor - 6 stage RODI auto top up -Wavemaster Pro running 3 Koralia 2's.
Fully stocked with fish, corals and usually some fine scotch
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