Lay down or Call down?

[crunchy1]

No great reads on either player - haven't played more than 75 hands with either of them. CO is showing a LAP icon; UTG is a FISH. Both of them are in the 60% VP$IP range.

Party Poker 2/4 Hold'em (9 handed) converter

Preflop: Hero is Button with A[img]/images/graemlins/spade.gif[/img], A[img]/images/graemlins/heart.gif[/img].
UTG calls, <font color="#666666">4 folds</font>, <font color="#CC3333">CO raises</font>, <font color="#CC3333">Hero 3-bets</font>, <font color="#666666">2 folds</font>, UTG calls, <font color="#CC3333">CO caps</font>, Hero calls, UTG calls.

Flop: (13.50 SB) K[img]/images/graemlins/diamond.gif[/img], Q[img]/images/graemlins/diamond.gif[/img], 8[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
UTG checks, CO checks, <font color="#CC3333">Hero bets</font>, UTG calls, CO calls.

Turn: (8.25 BB) 5[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
UTG checks, CO checks, <font color="#CC3333">Hero bets</font>, UTG calls, <font color="#CC3333">CO raises</font>...

I don't like a turn checkraise (after a PF cap) against 2 opponents when the third flush card hits - this card should be a scare card to him too. He's passive post-flop but, I really feel like I should be calling down. I also still have another player to contend with. What do you do?