Hey Roy,
Your nano is sure to be the hit of your office.
With a 5 gallon, two very small blennies or gobies are going to be about the limit for bioload. Or maybe one small fish and a shrimp. A piece or two of rock and you'll be set.
While it is advantageous to run a UV, skimmer and a sump on any tank, there are things to consider when setting up a tank at work so your boss doesn't look at you cross-eyed. (Unless you're the boss, lol) #1 is looks; if you have equipment hanging out all over, the powers-that-be might decide they don't like your tank after all. #2 is ease of maintenance. Chances are you won't have a utility sink close, so you'll need to maintain a "tank kit." Mine was just a bucket with hydrometer, test kits, cleaning tools, small syphon hose, etc. Make sure you *clearly* mark the bucket that it is for use ONLY with your tank. I stored mine in the office bathroom closet and came in one day to find the toilet scrubber brush in it!
You'll need to find a place to store this stuff as well as a gallon or two of saltwater for emergency water changes and RO water for top-off.
As far as filtration goes, you can certainly just run your tank with a small powerhead and a small hang-on-the-tank Whisper filter. (Remove the filter media, it will just gunk up the tank and you can use the well for a small bag of carbon when necessary or to put your heater in, if it's needed.) Do one or two water changes a week and your tank should run just fine. If you can fit a small skimmer on the tank, that would be great.
Oh, one other *very* important tip: hide the fish food! Your fellow employees will not be able to resist feeding your fish. Trust me on this one.
Have fun!
Alice
"A BRW Original"
