Since you already pick the fish, this may not be much use but I keep my Pandas in the tank without heater. And they do great, I get eggs every 4~5 days. There is no heater but there is a bulb of candecent(sp the regular old aquarium bulb and a compact florecent bulb) which I believe give off some heat. And temperature is usually low 70'sF and hover to high 60's. Also they really enjoy the nice water current so there is a powerhead with sponge on the intake. And it circulate the high oxygenate clean cool water.
It was the Panda only tank for a while but I decide to add few hill stream loaches since I believe their requirement is similar although their origins are far apart. So far, they live together great.
I also did consider the White cloud minnors as tankmate but I have enough Pandas in the tank and I know the minnors are also prolific so I didn't add to the tank. But maybe if I get bigger tank for the Pandas I may try. I already have 2 tanks for the Pandas.
Anyway, Pandas do great with lower temperature(68~72F) than the regular community tank temperature(around 75F) people tend to keep them in. IMO
I just thought you might want to consider them when you have some space(you can always get more tank or bigger lol).
Oh yeah, I did experimenting put the one female cherry shrimp with eggs in the tank with Pandas. Since the cherry shrimps are fine with the Pandas' tank water parameter and Corys are one of the peaceful fish. I would imagine Pandas would eat the smallest shrimplet if they can manage to catch since they would eat the BBS. But I think the cherry shrimplet would be smarter than BBS, they would try not to be eaten. And there are enough hiding places. So we'll see. If they can manage to survive and multiply. Then, they could be potential tankmate.