sumps are good for water changes. They also add more water volume to your tank. You can use older tanks or rubber maid tubs. Sumps can hold all your Pumps, Heater and skimmers so there is no need for them in the tank. Basically makes your tank clean and free of the crap u need. 
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75gal RR Tank with 2 Seio 620 and 2 maxijet 1200, 2 150watt HQI and 2 Antic PC, Turbo Floter Skimmer with 9.5 Mag to tank and fuge, Sump is 75gal with a 22gal fuge, 40gal Auto topoff.
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