i have a fuzzy dwarf lion in my tank. they have deceptively large mouths and can eat large prey for thier size. the clowns may be safe at the moment, but in the near future as the lion grows it may see the clowns and other fish in your tank as food.
fuzzys have the potential to grow up to 7", its generally smaller, but whats to say your lion wont hit maximum size? like i said, they have the potential to eat prey over half their length. so a 7" fish could eat a 4" one. just so you know...
not trying to put you off, i love my fuzzy dwarf, he's a real character in my tank, but its better to know what you may get into...
if your tank is a 187g i would think about getting a few fuzzys. they can do really well in groups (3+) providing there is no aggression... as they are from the same batch, same size, already used to each other ect... there shouldnt be much, and as there would be a few, any agro will be spread amongs the group.