let me see, tank as it is lucky to get $5k for it. as 2nd hand parts, $8/kg @ 150kg's of rock theres $1200, tank and plumbing $400, skimmer $700, chiller $700, calcium reactor $400, corals and fish $700, pumps $1000, refugium and contents $500, oceans motions $300, lighting $400, miscellaneous (test kits, refractometer, topup barrel, nozzles, powerheads etc etc etc) $800,... man there is heaps more than this and I'm already over $7k at very conservative pricing...