There are not many cold water fish suitable, but you are not cooling the water, it's just that you are not heating it right?
So really you can keep corydora catfish, because they accept a wide range of temepratures and will do very well in room temperature water. I'll say this despite the thumbs downs it's likely to get me from those who don't understand fish very well. Now, a group of 3-4 cory's and a group of 6-8 wcm will pretty much fill up this small and poorly shaped aquarium.
FYI, running your tank empty for about 24 hours aerates it and makes it safe for fish. Running it empty longer than this does nothing at all, it's just an empty tank sitting. You have been ready to add fish for 9 days now! Cycling a tank involves ammonia, and you can have a tank sitting empty for a year and it won't cycle.
You've done your homework so I have no dout you plan on adding just a couple of small fish in order to cycle your new tank right?
Do not buy fish just to cycle, it's pointless. Use fish you will be keeping anyway. As long as you start with just a couple of small fish, and as long as you feed lightly, and as long as you do regular water changes on the tank, all but the most delicate of fish can have no problem with the cycle.
