Yesterday L and I went and bought 6 more Cardinal Tetras. We felt that we needed more of them to fill the middle layer of the tank as it was looking a bit sparse. I was surprised to see that the extra 6 did not make much of a difference to the group, as they have blended in with the rest and are a bit smaller than the current ones. Instead of them all swimming around in one big group, the group now occasionally breaks into 2 smaller groups in different parts of the tank. I think increasing the numbers even further will improve the different group sizes and the overall appearance of the tank.
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