Whenever a fish expresses a change in behavior it is a good idea to test the water for ammonia, nitrite, nitrate, pH, temp. and SG
, (calcium and alkalinity too for reef). This will either rule in or out a problem with water quality. If all tests out good, then you know to look further for a reason. If anything is out of balance, then the water should be tended to prior to any further action, if needed.
From what I've witnessed with clowns (at least tomato clowns) is that the female will be busy 'cleaning' a spot near the anemone to prepare it for eggs. She'd actually be more active around the anemone. The male generally patrols the outer borders during this. Once prepared, they will spawn and take care of the eggs.
Having a pair of clowns does not guarantee they will spawn.
We, as a people, know so much more about outer space than we do about our own oceans. This lack of knowledge can very well spell the dangers that lay in wait for us.
The oceans surely would swallow us before a rock comes down to smite the planet of it's life.