They're easy to culture in huge swarms and would seem to me to fill
the bill nicely. They do float (so some fish won't take them), but
that doesn't seem to be a problem for CP, and they're easily killed
with hot water if need be. The only problem I could really think of
is that they're not big enough to trigger a mature VFT.
Bill Smith
smith@io.dsd.litton.com