I personally don't know much about the sharks, so can't comment on that - but I'm sure I've read that that's a bad match. Possibly a bad match with the gourami's, but again, I'm not sure on them.
The tetra's are likely to try and make a nice lunch out of the betta's fins, which could cause his fins to fall off and for him to get a bad case of fin rot. And the betta is likely to at one point, make a nice lunch out of the tetra's altogether.
Can't see much bother between the Betta and the cory's, though.