Clownfish,
Your local LFS should have some, name is DT live phytoplankton. It is also good for starting your own cultures.
Oh, here is a link I found that might help if you try it again.
I know I'm going to use some of the info.
Here is some interesting info on raising Lysmata amboinensis.
http://www.reefsuk.org/articles/capt...anershrimp.php
Good luck,
Steve