[jonnyv]

You said that you are tight. You need to loosen up your starting hand requirements a bit and play more suited connectors and one gappers along with As And Ks. If the game is loose passive with not many raises than get in there and take some flops. Fold if you don't catch a good draw and don't chase like the idiots do.
I aagree with Dynasty. After playing 6-12 to 15-30 these low limit games are easy. You have to learn to adjust to a loose passive game. Your pocket pairs will not hold up against many opponents making your drawing hands a better play. You are probably not respecting raises post flop with your big pairs and call all the way to the river and are beat by two pair a straight a flush or when the board pairs someone will be holding that card. Your raises preflop do not get people out, but you should still raise because you have the best hand.
Tight agressive play will get the money, but you need to loosen up in low limit. Becuase of the size of the pots you can take more flops because when you hit you will get paid off big. Just add more hands to your starting hands and trow them away if they don't hit. Take the pot odds into consideration also. Make notes on all of the players. Learn to put people on hands and start respecting their raises. Never bluff and play straight forward.