What does a cnidarian do with its food after it stings it?

Cindarians usually eat fish that they stun with their tentacles. "Farming their Food: Almost all cnidarians are carnivorous. Many eat small creatures or trap detritus, plankton and other microscopic titbits. But many also capture and eat large prey. Many cnidarians, however, more supplement their meals with food provided by photosynthetic zooxanthellae (symbiotic single-celled algae) that they harbour in their tentacles and bodies. These algae produce food from sunlight. In exchange, the cnidrian provides protection and simple minerals. " http://www.wildsingapore.com/chekjawa/text/p500.htm
food