oscar about ready to breed?

[caz]

over the past few days my oscar has picked up stones with his/her mouth, and moved them to another location clearing away the stones in one area to make a nest looking circle all the way down to the glass. also i have noticed that the fish has become very territorial all of a sudden, attacking the other fish, the pleco, and even my had or a net that i dropped in there. could she possibly be pregnant? oh yeah she has a bigger apetite now too.

 

[mooga]

my oscar does the same thing. even weirder, i have seen him vibrating(physically) with my convict doing the same thing on the other side of the tank.