Ace high flush in the board and two players have the same suited cards does they split the pot?

Nope, Ace is the highest form of flush, and its impossible for two players to have ace flushes on two different suits. So if you had an ace flush and somebody had a King flush or whatever, you'd get the whole pot. Or if the ace flush was out on the table, the person who got the pot would be the one with the highest card of the same suit