so if you have to wait 6 months to get fish for this tank, why not just get equipped for the 180 and spend some time doing research? i know it sounds silly, but this hobby requires knowledge of physics, biology, chemistry, plumbing, construction and ecology. the systems we keep are a lot more complex than "what fish can i keep in this tank with these fish". there are reasons things can and cant be done and it's not something that will be taught to you, you have to go out and learn it yourself. honestly, if you are seriously going to get a 180 in a year then i wouldnt waste $ on the 75... spend that time and money on reading some scholarly articles, books, etc.. none of us learned everything we know before setting up a tank but you have decades of experience suggesting to you to do a bit of reading. it sounds lame.... but not nearly as lame as wasting time and money. realistically, if you dont want to read-up on the subject of saltwater fish husbandry then maybe you ought to just pay someone to setup and maintain your system for you- you will save $ and the lives of marine animals. these animals and the future of the hobby that we all love are in danger. we spend thousands of dollars to create environments that will sustain marine life and every year that gets more difficult for us to do b/c their natural environments are constantly getting ruined by humans. it's not just about keeping a dope fish tank that you can show off to your guests, its about sustainability and protecting the wild reefs, too (aquaculture).