honestly, stop the bump.
pair yourself up the clowns.
its easy : get a big one and a small one. feed them heavily, provide a calm tank, wait and voilá.
clowns breed because they are well feed and feel safe.
if you are spending a couple of hundred euros or dollars on a breeding pair and your water quality sucks, you feed them the wrong food they are used to and your tank is full of bully fish they wont spawn
so its silly to buy a breeding pair unless its a rare fish ( mcculochi, etc ) and you are setting up a breeding aquarium for them.
for the 99% majority of mortals, get a clownfish book(s), read all you can, choose your species, get a small ( 20-30g is enough ) tank, get the biggest and the smallest clownfish you can find of the same species and let nature due its course.
feed them a good variety of foods, rotate the foods and feed them heavily.
and you must wait , if they dont feel safe, they wont spawn.