what size jig head should i put in a 3.5 inch tube and a 4 inch tube?

thanks

The lighter the better.My most common size is 1/8 oz.I will use heavier if i need to. 

also i forgot to ask, how do you guys fish your flukes? thanks again

also i forgot to ask, how do you guys fish your flukes? thanks again

theres a few ways, weightless on a 4/0 hook (I use 4/0's for the weight of the hook)  if the hook isnt enough weight to get it to fall at the speed you want you can add a swivel about a foot up the line,  if you want it to fall faster still try a weighted ewg hook

90% of the time when i fish flukes I'm using a split shot about 12" from the bait.Twitch it twice,pause and repeat.  8-)

The size of weight corresponds to the depth of the water.  I use anything from weightless to 1/2 oz. depending on how deep I have to go to get bitten.

Most of the time I can get away with 1/8 and 1/4 oz. heads.

If you are tube fishing a river the current also effects how big of a weight to use.  The rule of thumb is to use as light a weight as possible to get it to the bottom.

You don't want it to get carried far off into the current, but you don't want it to be too heavy that it loses action.

As said, most of the time you can get away with 1/8 oz

Depth, wind, current and the mood of the fish will dictate what weight you use. The other guys are right, light as you can get away with and get to and maintain bottom contact. Have some 1/8, 1/4 and 3/8 ouncers in your bag so you are ready for the conditions.  Try a fluke on a chatterbait sometime.  Sounds odd but it can be very productive.

There's nothing like the " ka dunk" when a smallmouth eats a tube.  I loooooove it !