You have a zebra nerite and a tiger nerite. Both reproduce in brackish water, so you don't have to worry about that. The wood looks great. As for the sword, I think you should move it slightly away from the wood. When it begins to grow, it may not develop evenly being pressed against the wood.
And yea, since its rooted it was already decent size when I bought it so I might have to plant it else where rather than near the driftwood. - Will post updates