The clowns are "snowflakes" a product of selectively breeding mis-bars.
If I remember correctly they are being bred by Tropical Marine Center (TMC) in England.
I can't say I've ever seen them available in Canada though.
Other lines produced in this way are the Picasso/Jigsaw.
The one pictured belonged to Embryoguy of RC (hope he doesn't mind me using his pic)
Theres also whats called a "naked" clown that is all orange with no stripes.