Missed raise or proper slow play...YOU DECIDE!

[fluxrad]

No reads since these guys come and go rather often and I don't have the scratch to buy PT. Should I have raised this flop or is this a correct slowplay (this is the part of my game where I think I try to get too cute. sorry if this post is obvious).

Paradise Poker 0.25/0.50 Hold'em (10 handed) converter

Preflop: Hero is UTG+2 with 8[img]/images/graemlins/diamond.gif[/img], 8[img]/images/graemlins/heart.gif[/img].
UTG calls, <font color="#666666">1 fold</font>, Hero calls, <font color="#666666">3 folds</font>, CO calls, <font color="#666666">1 fold</font>, SB completes, BB checks.

Flop: (5 SB) 4[img]/images/graemlins/spade.gif[/img], 6[img]/images/graemlins/diamond.gif[/img], 8[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(5 players)</font>
SB checks, <font color="#CC3333">BB bets</font>, UTG folds, Hero calls, CO folds, SB folds.

Turn: (3.50 BB) 4[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">BB bets</font>, <font color="#CC3333">Hero raises</font>, BB calls.

River: (7.50 BB) 4[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
BB checks, <font color="#CC3333">Hero bets</font>, BB folds.

Final Pot: 8.50 BB