So I used to have a school of 12-15 cardinal tetras. Disease broke out and I was down to 2 cardinals. Rather than shell out $4 a piece for more cardinals, I found a deal for neon tetras at $1 a piece. I bought 10 neons thinking the cardinals and neons would surely school together and be happy. The two cardinals will try to school with the neons, successfully for a few minutes and actually seem to lead the pack at times, but then out of nowhere it's like a few neons notice they are different and chase and nip them out of the group. Once the few neons chase, the rest of the neons follow suit and all of a sudden hate the cardinals. What gives? I thought cardinals and neons could school peacefully? Is this a pecking order being established or an underlying trait of neons and cardinals not getting along?