$1.20 Flopped flush. Should I slowplay?

[RunNJump]

Hi, I wasn't sure if I should have slowplayed this. I was kind of worried about somebody staying with the As, so I thought I should bet here. Thanks.

PokerStars No-Limit Hold'em Tourney, Big Blind is t150 (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Button (t2580)
SB (t3885)
Hero (t1930)
UTG (t2805)
MP (t1245)
CO (t1055)

Preflop: Hero is BB with K[img]/images/graemlins/spade.gif[/img], 4[img]/images/graemlins/spade.gif[/img].
UTG calls t150, MP calls t150, <font color="#666666">3 folds</font>, Hero checks.

Flop: (t525) 9[img]/images/graemlins/spade.gif[/img], 6[img]/images/graemlins/spade.gif[/img], 8[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">Hero bets t250</font>, UTG folds, MP folds.

Final Pot: t525