Congrats! A 25 or 30 gallon sump should be fine.... Seeing as how you have a 24" wide tank.... go to Canadian Tire and get one of their storage totes, reinforced with a lid, for a sump. I bought one for $25.00 (25 gal) and it works like a charm... easy to drill & put fittingson etc etc etc.... definitely the cheap way to go...
Just do a little reading on pump flow & overflow capacity.... I think 1" returns are good for up to 600 gph.... and the Mag 18 will pump 1800 gph at zero head.... but probably more like 1200gph at 4' of head...
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135G Mixed Reef. Bullet 2, 25 gal refugium, 2 X250W MH + 4X 96W PC\'s, DIY Calcium Reactor, Coralife 1/6 HP Chiller, Phosban, Tunze, 2 closed loops & SQWD\'s, Seios, Coralife 4 stage RO/DI & a bunch of other expensive gadgets... I may never retire, but I'm gonnahavahelluvanaquarium!
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