Red Tail Shark Behavior

[snus29]

i recently bought 3 red tail sharks from my local petco and there are 2 specific sharks that are rubbing against each other and chasing each other around. it doenst look to be a territorial issue because every now and then they gently rub against each other for a period of time. im really confused on what to think of their behavior. Are they mating, fighting? i dont know. please help. thanks

 

[lauraf]

Breeding red tail sharks is extremely rare, whereas fighting among themselves is extremely common. I'd suspect the latter...sometimes aggression is mild-looking at first. Might want to consider only keeping one.