Tetras playing

[justinhill]

Not a question, more an observation. My school of 13 cardinal tetras crowd together in one corner of the tank and swim up and down. But here's the thing. They start doing this around 7pm every evening, and carry on for up to an hour, until the tanks lights turn off at 8pm. They never do it at any other time of the day and it's always the same corner. Astonishing.

 

[Colin_T]

Maybe they are waiting for you to feed them, if you come from that side of the tank. Or perhaps they are breeding.