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The betta not resting shouldn't be a big deal, when I moved mine into a bigger tank it definitely got a lot more active and looked a lot happier. You could try lowering the filter pressure even more though as they don't like too much current in the water.
I've also heard that Betta's might pick on the shrimp and will definitely eat it's eggs if they decide to breed. But it would depend on your luck of finding the right Betta with the right temperament.
Regarding the snail, the Betta might have been nipping at the snail's tentacles when you're not looking which could have killed it.
If you do upgrade to a 10g, you could consider picking up a couple of Cory's, they are active and cute bottom scavengers.
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