I'm not sure about the fighting. Here is though some info I founf that might be of interset to you:Family: Hymenoceridae ("wax membrane") Harlequin/Clown/Painted/Dancing shrimps (Hymenocera picta - "painted or
variegated") feeding habits are absolutely fascinating. Their diet consists solely of the tube feet of echinoderms, the most popular
class being the asteroids (sea stars). They'll even eat Crown-of-thorns starfish. When they find a victim, a sea star for example,
they will turn it on its back and drag it back to their lair, where they'll systematically feed from the tip of one leg down to the
base and then start on the next one. This way, the animal is kept alive for some time. These shrimp are a very secretive species
and few of its habits have been observed under natural conditions. During daylight they keep to the protection of the reef and
only go out to feed at twilight or complete darkness. It's almost always found in pairs with the female being the larger of the
two. They grow to about 6cm (2.4") and live from low tide down to about 10 metres (33'). Their large foreclaws are not used
for feeding but rather display. I've never seen these offered for sale in Australia but have heard they are occasionally available
elsewhere. I wouldn't buy them unless you had access to a constant supply of sea stars. Apparently, sea stars can be kept
frozen and thawed out when necessary. Of course, you wouldn't be the smartest of people if you kept a pair of these in a tank
with a prized echinoderm.
