A nut flush draw and a big pot

[johnzzz]

Low limit Hold'em (9 handed loose table) FTR converter on zerodivide.cx

Preflop: Hero is MP2 with A[img]/images/graemlins/club.gif[/img], 8[img]/images/graemlins/club.gif[/img].
UTG calls, UTG+1 calls, MP1 calls, Hero calls, <font color="#666666">1 fold</font>, CO calls, Button calls, SB completes, BB checks.

Flop: (8 SB) 4[img]/images/graemlins/club.gif[/img], 5[img]/images/graemlins/club.gif[/img], 2[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(8 players)</font>
SB checks, BB checks, <font color="#CC3333">UTG bets</font>, UTG+1 calls, MP1 folds, Hero calls, <font color="#CC3333">CO raises</font>, Button calls, SB calls, BB calls, UTG calls, UTG+1 calls, Hero calls.

Turn: (11 BB) K[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(7 players)</font>
SB checks, BB checks, UTG checks, UTG+1 checks, Hero checks, <font color="#CC3333">CO bets</font>, <font color="#CC3333">Button raises</font>, SB folds, BB calls, UTG calls, UTG+1 folds, Hero calls, <font color="#CC3333">CO 3-bets</font>, Button calls, BB calls, UTG calls, Hero calls.

River: (26 BB) Q[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(5 players)</font>
BB checks, UTG checks, Hero checks, <font color="#CC3333">CO bets</font>, <font color="#CC3333">Button raises</font>, BB folds, UTG folds, <font color="#CC3333">Hero 3-bets</font>, CO folds, Button calls.

Final Pot: 33 BB

With a possible nut flush and 8 at the flop I played this steathily, letting the pot build and waiting to pounce. But should I have been aggressive earlier?