09-02-2012, 02:24 PM
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The rock would all be your decision. Live Rock does have some neat hitch hickers, not all bad. There are some none keepers thatpeople just don't want to deal with. IE- Fireworms, Aiptasia. But the feather dusters, sea stars and most other things are great to have. Plus side, all the organisms that come with it. Down side, some of the organisms that come with it. Aiptasia can be eaten by Peppermint Shrimp, so those are not a huge problem to deal with, some shrimp though, once they figrure out you feed the tank, will stop eatin the critters they are supposed to.
As for the Citrinis Goby, yes they do require cooler temps, but they are right at the edge of what we keep our tanks at anyways. They require form 72-78, and most SW tanks should be kept at 76-82. So, technically you can keep yoiur tank between 76-78 and not have a problem with them or the other fish yoiu plan on keeping. Your heater will probably only come on at night, and keeping a cpu fan blowing across the surface of your tank will keep it cooler.