Hi,
Squid is much easier to chop/mince if you freeze it first. I agree, it's hell trying to untangle gooey tentacles from the blender.
You can also buy mixed chopped raw seafood at Asian supermarkets. Ditto on seaweed and such. You can even get fish roe there.
Ken
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See my reef tank at
http://kenspage.jumphobbies.com/reef2.htm