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In our previous house we went away for New Years, the upstairs toilet cracked, no plumber had ever seen anything like it. We got home the house looked like it had been bombed straight through the middle of the house. Huge disaster.
You have to do your hypo before adding inverts..... after that even peppermint shrimp will be huge. I bought three at the last invert buy two went in my son's nano 24G and one in my 120...the two in the nano are great the one in the big tank obviously just gets lost. So in a nano you can go...
Don't worry about it, if your tests show zero now aim to do very frequent water changes to keep everything steady and at the same time do your hypo. It will all work out. Any buildup should be diluted on almost daily basis with water changes(I do it that way in QT with 1G a day life is easy).
Generally no you don't have to bend over backwards to be there to let them in, but they may be allowed to come in if you are not there. Realtors will abuse you if you let them, you are not the one selling the house so they need to accommodate you.
If you are doing it right try to make sure your fish are free of all diseases...use this opportunity to do make the tank a hypo-salinity to kill any ick. Then bring the tank up to regular salinity. Let it stabilize and then bring in a BTA....maybe for Christmas or something.