With my tank and the current configurations the total volume will be 800+ gallons. I've looked around a lot and think that I'll stick with my SRO 3000 internal while running frag tank and other systems (~300 gallons) and add an external SRO 5000 in the future. If I were you I'd go with the External if it will support another 100g and then you know you're not going to have to upgrade if you stock the tank heavier later down the road.
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INDMAS President
Check out my tank in the Large Tank Forums, "A Reefaholic's 1000+ Gallon Mixed Reef System Build"!
Current Tank Info: 600 Gallon DT, 140 Gallon Grow Out Tank, 125 Gallon Sump, 90 Gallon Fuge, 200 Gallon Fish QT, 15 Gallon Frag QT
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