Last night I was given 100 small cherry shrimp by a friend and I put them in my betta tank, however, both my male bettas were chasing them round and round and now I fear going downstairs as I don't want my 2 crazy fish to have eaten them all 
Bettas do tend to eat them, just hope they have a lot of hiding space? If they don't then I think you will be missing a few
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both my male bettas were chasing them round and round