NL200 two pair raised on turn

[rberg]

villian is unknown, he just sat down a few hands before.
The hand before this one he got it in with 2nd pair on a KJxss flop vs. my nut flush draw and held up.

What do you think about the turn?

Full Tilt No-Limit Hold'em, $2 BB (6 handed) Full Tilt Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

CO ($206.60)
Button ($207)
SB ($66.25)
Hero ($320.70)
UTG ($200)
MP ($282.10)

Preflop: Hero is BB with J[img]/images/graemlins/diamond.gif[/img], Q[img]/images/graemlins/diamond.gif[/img].
<font color="#666666">1 fold</font>, <font color="#CC3333">CO raises to $6</font>, <font color="#666666">2 folds</font>, Hero calls $4.

Flop: ($13) Q[img]/images/graemlins/spade.gif[/img], T[img]/images/graemlins/diamond.gif[/img], 7[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
Hero checks, <font color="#CC3333">CO bets $6</font>, Hero calls $6.

Turn: ($25) J[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">Hero bets $18</font>, <font color="#CC3333">CO raises to $56</font>, Hero ?