Main drain is usually where the hot water tank is. I have my frag tank plumbed right to it for easy water change system and located my sump close to there for just incase my sump should overflow. Love it takes me 5 mins to do a water change. Just have to open 2 valves. Although I only change my water once every 2-3 months lol
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riceboys 82.7 gallon sps dominant tank
-concept built 3'x2'x22" full starfire tank with starfire 1 piece eurobrace and built in wave box, 1 jebao wp25, 4 mp10wes, ati led Hybrid 8 bulb fixture, csc 250 skimmer, Magdrive 18 return pump, apex lite, custom sump from concepts, biopellet reactor and carbon and gfo,bubble magnus doser and jbj ato, custom acrylic frag tank with 6 bulb t5
http://www.canreef.com/vbulletin/showthread.php?t=70851
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