How much to raise preflop against calling stations?

Was playing 2/5 at my local cardroom and everytime I would open to $20 - 25 I would often get 3-4 callers and pretty much never get 3 bet unless someone has JJ+. If I wasn't in the hand, preflop would limp through a lot.

Should I increase my preflop raise to something like $30-35 so less players call? Does this mean I need play tighter as well?