how to breed? too many questions..

[FishLover00]

how to breed northern water snake?

my snake is in my tank with my fishies, @_@ as of now, none is dead.

is it safe to keep balla shark,rainbow shark,blue and dwarf gourami?

is it possible to breed balla and rainbow shark?

do 9 1/2 inches silver arowana fit on 30 gallon tank?

thanks