PL$25 AK makes TPTK... am I too passive?

[RobTheDuck]

I realize the flop bet probably should have been bigger. I am mostly wondering about my turn check, and what to do on the river. Thanks in advance, Rob

Full Tilt Poker, $0.10/$0.25 PL Hold'em Cash Game, 6 Players
LeggoPoker.com (http://www.leggopoker.com) - Hand History Converter (http://www.leggopoker.com/hh)

SB: $36.85
BB: $25
Hero (UTG): $31.25
MP: $4.40
CO: $19.30
BTN: $24.05

Pre-Flop: A/images/graemlins/spade.gif K/images/graemlins/spade.gif dealt to Hero (UTG)
<font color="red">Hero raises to $0.85</font>, MP calls $0.85, CO calls $0.85, 3 folds

Flop: ($2.90) 4/images/graemlins/heart.gif K/images/graemlins/club.gif 9/images/graemlins/heart.gif (3 Players)
<font color="red">Hero bets $1.45</font>, MP folds, CO calls $1.45

Turn: ($5.80) 6/images/graemlins/heart.gif (2 Players)
Hero checks, CO checks

River: ($5.80) 9/images/graemlins/diamond.gif (2 Players)
Hero checks, <font color="red">CO bets $5.80</font>, Hero ???

[ceavou22]

Yes flop bigger bet needed. Turn is ok to check sometimes for pot control though I probably bet again here to protect/value. As played you are going to induce sometimes by checking the turn and river so its player dependent for river.
Probably should fold to pot size bet but I reckon I would call.

[icheckraiseu]

I would bet ~2$ on flop. Turn - on NL25, i would bet most of the time, around 2/3 PSB is ok there.
As played, i call the river bet.