is there a special kind of knot to use for big lines (20lb mono)? i tried tying my normal knots and they werent working.

The trilene knot seems to work well with about 3-4 twists.  I use it for 17lb.

Practice tying a San Diego Jam Knot. It's strong, pretty and I think you'll like it.

8-)

The uni-knot (6 turns) works for me, I use 20# fluorocarbon on lots of my rigs.

thanks for the responses

I just finished watching "Bass Edge",  The past two episodes they have been having knot wars.  The palomar knot has yet to be defeated.  This week it beat the "trilene" knot,  I can't remember what knot it beat last week.  The knots seem to work fairly even on mono but, when they go to braid, the palomar edges them out.