CELESTIAL PEARL DANIOS (CPD) | How many can I put in a tank

Celestial Pearl Danios or galaxy rasboras are a fantastic fish for any size aquarium, but how many can I put into a tank? I hope to help answer that question in today's Celestial Pearl Danio species profile.
First off I would like to clear up some confusion. While they were originally called galaxy rasboras, they were found to not belong to that group of fish so the correct name for these fish is celestial pearl danios or danio margaritatus.
I have been keeping celestial pearl danios now for a year and have been breeding them for 8 months. So I have seen all the different live stages of them from newly hatched fry to adult CPDs. And to clarify something that I didn't mention in the video, I have kept 6 in a 5 gallon tank perfectly fine and that is actually the tank size I bred them in.
After keeping celestial pearl danios for this amount of time I have come to some conclusions based on what I have seen in my tanks. I think there is a social hierarchy within the shoals of CPDs. I think that this social hierarchy dictates the number of fish you can keep in a tank. As I said in the video I had about 30 adults living in my 27 gallon cube with no problems what so ever. After adding 80 juveniles to see if that would change the way they behaved in terms of schooling or shoaling I did not notice a large difference in their behavior. They did not start schooling with an increase of numbers, though I had been hoping they would.
I eventually started to have the runts dying off in my aquarium, which was to be expected since I didn't cull any of the smallest fish when I was raising them up so I was not surprised by them dying. Then I started to notice healthy juveniles that had not issues start developing a pinched fin, raspy breathing, and pinched pectoral fins. I recognized that this was a stress induced problem and immediately started moving them out of tank into another tank. I did this with 4 celestial pearl danios as mentioned in the video and 3 of the made a full recovery with no medication dosed, just a changing of tanks from one planted tank to another planted tank.
So in my findings for the number of fish I would recommend to keeping in a tank obviously varies based on tank size, more so the foot print of the tank. When I had 30 fish on my 360 square inches of floor space, they were fine and happy with 12 square inches of floor space, but they were not happy and started to pick on one another when they only had 3.6 square inches of floor space for each fish.
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