My red devil acting strange?

he is a little over a year, nothing has changed in his tank and i have mantained it regularly, and he is getting last couple of days extra agressive (he is by himself) but attacking the glass, heater and gravel a lot and he is starting to get bright red, but his abnormal behavior is he is hovering round the top and not moving as much, is this normal
Answers:
That's fairly normal for aggressive cichlids as they mature. Certainly not all develop these behaviors, but many will.
MM