I am getting the tank today:0 I am so jittery and excited I can hardly type. It is a 36 gallon with the stand and accesories for only $50(USD) I am getting it today or tomarrow and start to cycle it ASAP!
That is usually a sign of a pair getting to know eachother. Otherwise, it could very well be aggression in two males. But, as long as they are not getting rough I woud say they are a pair. Pictures would be helpful.