Looks good Fish!
Submersible 5w halogen? Do I dare ask where you found such a beast?
Personally I'd be thinking more along the lines of LED lighting (some of those new 22,000 MCD whites would make a great light array), Little less heat - little less power too. They do put out some good heat themselves - but nowhere near what others will. They also run on 12v so less worry of high voltage underwater.
As for the fish question... There are a number of gobies suited to small tanks - I've got a red headed goby in my 2.5. I know of various clown gobies kept in a 2.5... A barnacle goby would be wild - if you could find one.
Since you have the 20 at home - you could always buy small and move them later. I saw a whole tankfull of little (1/4") percs somewhere last week. Might make a great resident for a few months.
Andy
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