Fully stocked at 75.00 - 100.00 per gallon.. I wouldn't under estimate the cost of a reef this size. Sizing your equipment correct, and for ease of maintence. I wouldn't cut corners... The plumbing alone will run several thousand dollars. Along with all the man hours to install. I'm guessing that 50,000 to 70,000 would be a closer figure. But than I'm not going to spend the hours of research. Along contacting all the dealers for pricing this project will require. although I sure wish someone would pay me, for that project. Sounds like fun though, keep us posted......