25/50 trips on dangerous board facing bet and call

Fivehanded game on Prima.

SB has 6K, BB 3K, Hero 4K. I've been raising a lot preflop, and giving up after betting the flop. Usually I'd get one or even two callers.

I open UTG+1 for 160 with A[img]/images/graemlins/heart.gif[/img]9[img]/images/graemlins/heart.gif[/img]. SB and BB call

Flop (480) Q[img]/images/graemlins/club.gif[/img]9[img]/images/graemlins/spade.gif[/img]T[img]/images/graemlins/spade.gif[/img]

Check, check, check.

Turn (480) 9[img]/images/graemlins/club.gif[/img]

SB bets 400, BB calls, Hero?