thanks hazel and krissy!
krissy i'm still perfecting it - it has turned otu to be very problematic, but i'm just using a regular tube mold.
i still have to figure out if i need to leave them in longer or shorter and maybe my mixture needs to be more moist. i made 6 more last night and all of them broke in half. thank goodness i like to throw the fizzy ball stuff in the bath tub LOL