Help with fighting sleepers

[Brando]

My unseperable pair of yellow head sleeper gobies have been together ever since I got them. Now one of them stays in the upper corner of the tank, just below the water line. When he trys to swim, the other goby will quickly dart at it and scare it back to the corner. What should I do??? Thanks

 

[Reefeross]

Hmmm...When did you get them? I'm willing to bet they have reached maturity and the more dominant one is being assertive. I don't think Sleepers mind each others company usually though....Try moving some of your Live Rock around to break up territory lines, if that dosn't work you may have to seperate them.