How much should I push a small flush?

[Withen]

I pushed this flush pretty hard, when I had the fourth-lowest possible flush (only 2[img]/images/graemlins/club.gif[/img] 4[img]/images/graemlins/club.gif[/img], 2[img]/images/graemlins/club.gif[/img] 5[img]/images/graemlins/club.gif[/img], and 4[img]/images/graemlins/club.gif[/img] 5[img]/images/graemlins/club.gif[/img] made a lower flush). Was I too aggressive? Also, should I have raised my flush draw on the flop for value? At the time I rationalized not raising because my flush, if made, might not be the best flush, but now that I think back on it, if I'm going to cap the turn when I hit my flush, then I should've bet the flop as well.

Party Poker 2/4 Hold'em (8 handed) converter

Preflop: Hero is BB with 6[img]/images/graemlins/club.gif[/img], 3[img]/images/graemlins/club.gif[/img].
UTG calls, UTG+1 folds, MP1 calls, MP2 folds, CO calls, Button folds, SB completes, Hero checks.

Flop: (5 SB) 9[img]/images/graemlins/spade.gif[/img], T[img]/images/graemlins/club.gif[/img], Q[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(5 players)</font>
<font color="#CC3333">SB bets</font>, Hero calls, UTG calls, <font color="#CC3333">MP1 raises</font>, CO calls, SB calls, Hero calls, UTG calls.

Turn: (7.50 BB) 7[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(5 players)</font>
SB checks, Hero checks, UTG checks, <font color="#CC3333">MP1 bets</font>, CO calls, SB folds, <font color="#CC3333">Hero raises</font>, UTG folds, <font color="#CC3333">MP1 3-bets</font>, CO calls, <font color="#CC3333">Hero caps</font>, MP1 calls, CO calls.

River: (19.50 BB) K[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">Hero bets</font>, MP1 calls, CO folds.

Final Pot: 21.50 BB