clown fish spawning age

[mpmitche]

how old/big do occelaris clowns need to be before they will spawn?

[espenlg]

I'm just following up on this, I would like to know the answer to this myself.. I have to clowns about 20 months old, but I can't say I've seen them spawn yet. Do they need to be a certain age to be capable of spawning?