we've got mystery snails in three of our betta tanks, and the only aggression we've ever seen was when we introduced Perry to Hannibal's tank. Hannibal circled around him like a shark, investigating this new thing, for about half an hour, and then ignored him. the only other problem we've EVER had was that Hanny likes to carry around Perry's algae wafers like a dog with a bone.
So remember, when you're feeling very small and insecure,
How amazingly unlikely is your birth,
And pray that there's intelligent life somewhere up in space,
'Cause there's bugger-all down here on Earth.
Loki/Grendel/Gail/Beowulf/Camilla/River/Bathory/Arwen/Lafayette/Deb/Jack Skellington (soon)