Bright colour for a very dull day

Rain, then heavy snow than rain again today, so looking around for a little colour I spotted these two male Platys squaring off against each other for possession of the females in the our Aquarium.
When they are not eating they are full time sparring like this, fortunately never coming to blows, usually the deeper coloured one gives in first and a mad chase ensures till the other loses interest.
A few minutes later they are at it again!