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Sorry I did not see this thread before.
I don't see why you can't use a blender, so yes.
No, if you use gelatin, DO NOT COOK! Just follow the instructions on the jell-o. I always add a little less water, so it stays together better.
Yes, fish will try pretty much anything, and many forum members have had good sucess with potatoes.
You can feed them to any fish, but I don't know if bettas would like them, only one of my two did.
I guess you can add meat... I'd cook it, but I don't know how good it would "keep". definitely freeze it.. I think it would *probably* work.
Hope this answers you questions.
Brianna
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