In the games mentioned, stud 8 and omaha 8, straights and flushes do not count against you.
Here's teh relevant section from the
poker stars page:
Ace to Five Lowball Hand Ranks
This method of ranking low
hands is used in traditional Hi/Lo games, like Omaha Hi/Lo and Stud Hi/Lo, as well as in Razz, the ‘low only’ Stud game.
Note that suits are irrelevant for Ace to Five low. A flush or straight does not ‘break’ an Ace to Five low poker hand. Aces are always a ‘low’ card when considering a low hand. Please also note that the value of a five-card low hand starts with the top card, and goes down from there.
Five Low, or
Wheel: The Five, Four, Three, Deuce and Ace.
In the event of a tie: All Five-high hands split the pot.
Six Low: Any five unpaired cards with the highest card being a Six.
In the event of a tie: The lower second-highest ranking card wins the pot. Thus 6, 4, 3, 2, A defeats 6, 5, 4, 2, A. If necessary, the third-highest, fourth-highest and fifth-highest cards in the hand can be used to break the tie.
Seven Low: Any five unpaired cards with the highest card being a Seven.
In the event of a tie: The lower second-highest ranking card wins the pot. If necessary, the third-highest, fourth-highest and fifth-highest cards in the hand can be used to break the tie.
Eight Low: Any five unpaired cards with the highest card being an Eight.
In the event of a tie: The lower second-highest ranking card wins the pot. If necessary, the third-highest, fourth-highest and fifth-highest cards in the hand can be used to break the tie.
An Eight Low is the weakest hand that qualifies for low in Omaha Hi/Lo and Stud Hi/Lo. However in Razz, there is no such ‘qualifier’ and the lowest hand will always win the pot, even if it is a nine low, queen low, or even a pair!