I would not suggest Emperor Tetras here, I think having had them a couple times, both species, a 3-foot tank is best. They do like to swim around. And mine got rather feisty with all the other characins in the tank, and that was in a 5-foot tank. No idea why, but it is an active species and this usually means more space requirements.
More neons are OK, you have eight (and the pandas) and you could double this if you wanted. I would increase the pandas with a couple more, say 9 total. There is room for another species or two, but it needs to be smallish and peaceful.
More neons are OK, you have eight (and the pandas) and you could double this if you wanted. I would increase the pandas with a couple more, say 9 total. There is room for another species or two, but it needs to be smallish and peaceful.