So, my red-tailed sharks have been chasing each other around like in the above video.
What are they doing?? Is this mating/spawning behavior or aggression? They never seem to actually bite each other or sustain injuries. They just chase each other around and then rest for a bit, then go back to chasing. They don’t do it constantly or anything, usually just in the evenings for some reason.
I’m pretty sure one is male and one is female, and they were given to me a few months back by someone who’s tank had broken and they had to get rid of all the fish. They’re at least seven years old and have lived together their whole lives.
Tank is 55 gallons, 0 ammonia, 0 nitrites, 10-15 nitrates. Tank mates are angelfish, kuhli loaches, black neon tetras, silver hatchetfish and snails. All get along very well.