What's Up?

For the last two days, one of my angelfish has been acting rather peculiar.

John McFish (shown here) has staked out a section of the aquarium that happens to be right in the middle. He spends his time driving everyone else away from that region - the other angels, the tetras (who are usually ignored by angels) and even the pleco. His stripes are very dark, which shows he is at a heightened state of alert.

What's causing him to act this way?

Oddly, his actions are those of a breeding male. One who has staked out the best spot to fertilize eggs. One who knows he can defend the eggs and babies from predators. The dark colors intimidate other fish, because it shows he's ready for a fight.

The only problem is he doesn't have a mate.

There are several female angels in the tank. Maybe he's trying to impress them. I will be on the lookout for some mating in the upcoming days.