May be male and female. If they are mouth brooders that is how the male fertilizes the eggs in the females mouth. Could be thats whats going on. Keep an eye on them. If they arent ripping fins and such, they should be ok.
One seems to avoid the other such as during eating. Does it just not like the other one much? Lol. If it happens again i'll try to video tape it so u can interpret it better. Maybe when I get more it'll go down some.
I dont know how much you know about the habits of the mouthbrooders but that is what the eggspots do. The male has them originally to look like eggs. The female tries to pick them off the male and the male "fertilizes" the eggs in the females mouth while she is there trying to do that. I am trying to put it nicely. This process usually ends up in them chasing each other around in circles. If they where fighting they would more likely be going face to face and ripping at each others fins .....etc.