Saes Dancing/spawning Dunno?

[hellohefalump]

Sometimes my two SAEs (definately SAEs, the black stripe goes right down the tail) do a little shimmy dance, while nibbling at each other, and their colours go really dull so you can hardly see the stripe.

Is this breeding behaviour?

Usually they're best friends, don't fight, and have a distinguished stripe down the sides. They're very healthy.

I ask because they're doing it today and I've seen them doing it on occasion before.