I used to feed each one, now I usually feed the tank some cyclo-peeze first, mine will open within 5-10 minuts, then I dump in some mysis and brine shrimp.. they always seem to get some, and they are over a year old now.
http://www.canreef.com/phpBB2/viewtopic.php?t=16066
Just scoll down a bit.
Walter