cardinal tetras being kind of territorial.. is this normal?
I have 25 cardinals, about 1 in in length. I have noticed a few of them being territorial towards each other. They don't really school in my tank, no real pred's and the only time i see em school is if my hand go in the tank to rescape or prune my plants ect. they obviously get a little nervous at that point.
Specifically I have these 3 cardinals, i can't be sure its always the same once but its the same spot in the tank, right above a piece of driftwood. one will be there and the other 2 on either sides and he will defend that spot. and the other 2 want it for some reason. its almost like a game of cat and mouse or tag or something. there is also a few that do this kind of thing in more of the open space of the tank by some tall stem plants. one will hold a position and the others normally 1 or 2 will try and i guess take over the spot.
most of the day they suspend all over the tank in no real formation and do what i think is playing around with each other. just wondering what you guys think of this behaviour.