I bought 8 semi-adult Pandas at last December. Unfortunately 1 passed away. But they start breeding since January and I sold or trade about 50 1"er. Now I have 10 (3 2nd generation) and God knows how many frys in 10 gallon jungle. I don't have time to separate eggs and frys to raise anymore. So the tank is sort of survival of fittest now. But there are no other fish but little 1~2 months old glow light tetras. I'll see how many more grow to the safe size(about 1 "). I lose lots of fry before then. Anyway, like many people say they like to be school. 6 would be good but they don't mind 8 or 10 or more.
You can have as many as you can fit in the tank. Just make sure to feed them well since they are such a greedy pig. I swear they would eat all day if I feed them.
And I think Panda won't be much bigger than 1 1/2"(TL) although I read someone claim that he has 4 " Panda. Although he never show the picture when we ask it. So I am not sure about it.
Anyway, I think Panda is cutest cory although some people think they can be delicate. They may be since I haven't kept many other corys but they would be fine if you know how to keep the water quality high and their stomach full. All the Pandas I lost had this hollow concaved stomach. Almost all the Pandas I lost was young, probably 1 month or less. Some reason, I lose many frys at that age.
I hope I can do better. I am always looking to improve my raising technique. If someone out there have good success raising Panda frys and have any tips you can share with me, I would be appreciate it. Since I feel I don't get enough young Pandas when I consider the number of eggs I am getting every weeks. `
Anyway, they are great peaceful fish. I can't stop looking at them. Either winking or forming T-form.