Archocentrus multispinosa

This is a video that I shot a while ago with my old camcorder (hence the not-so-good quality).  There are four male rainbow cichlids in this tank, and two of them used to stay colored up most of the time and spar with each other for dominance.  The oscars in with them have since grown up, and now the rainbows are not so confident.  The display that these fish put on is a good example of territorial competition without actually fighting.  The fish on the left ‘owns’ most of the space, while the fish on the right tries to hold onto just about one quarter of the area in the tank.  I like how they both look surprised whenever they run into each other.

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