Warr - Yes - I definitely think that this camera would be AWESOME in taking pics of your tank. BUT, make sure that the F-Stop it can handle is at least 8 or higher, AND that you get a DECENT macro lense/setting with the camera.
i didnt go thru all the specs, but for that dsoh you are better off with an entry level slr from cannon or nikon. cannon 400d with decent lenses will give you better value in the long run with better quality glass internal of lenses and beter quality pics...assuming, as viper so easily points out....thats its the camera quality not the person behind it thats limiting factor.
but heck, slipping one home for long time demo version would be a great idea...just if i were to spend the money i wouldnt fork out on it. just my humble opnion