What is the best move here? 25nl river trips

[bigjared]

Ultimate Bet - No Limit Hold'em Cash Game - $0.10/$0.25 Blinds - 6 Players - (LegoPoker Hand History Converter)

SB: $9.30
Hero (BB): $25.00
UTG: $26.23
MP: $30.71
CO: $29.97
BTN: $14.39

Preflop: Hero is dealt 7[img]/images/graemlins/diamond.gif[/img] J[img]/images/graemlins/heart.gif[/img] (6 Players)
UTG calls $0.25, MP folds, CO calls $0.25, BTN folds, SB calls $0.15, Hero checks

Flop: ($1) 8[img]/images/graemlins/diamond.gif[/img] J[img]/images/graemlins/club.gif[/img] 6[img]/images/graemlins/diamond.gif[/img] (4 Players)
SB checks, <font color="red">Hero bets $0.75</font>, UTG folds, CO calls $0.75, SB folds

Turn: ($2.50) 5[img]/images/graemlins/club.gif[/img] (2 Players)
<font color="red">Hero bets $1.50</font>, CO calls $1.50

River: ($5.50) J[img]/images/graemlins/diamond.gif[/img] (2 Players)
Hero checks, <font color="red">CO bets $5.50</font>, Hero ???