when to check down?
 

I checked down thinking by getting two callers one had trips. What should I have done differently?

Ultimate Bet No-Limit Hold'em, $.02 BB (8 handed) converter

MP1 ($1.72)
MP2 ($1.93)
CO ($1)
Hero ($1.65)
SB ($3.87)
BB ($1.23)
UTG ($1.34)
UTG+1 ($1.02)

Preflop: Hero is Button with K[img]/images/graemlins/club.gif[/img], A[img]/images/graemlins/heart.gif[/img]. CO posts a blind of $0.02.
<font color="#666666">2 folds</font>, MP1 calls $0.02, MP2 calls $0.02, <font color="#CC3333">CO (poster) raises to $0.11</font>, Hero calls $0.11, <font color="#666666">2 folds</font>, MP1 calls $0.09, MP2 folds.

Flop: ($0.38) A[img]/images/graemlins/spade.gif[/img], 3[img]/images/graemlins/heart.gif[/img], 5[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
MP1 checks, <font color="#CC3333">CO bets $0.02</font>, <font color="#CC3333">Hero raises to $0.2</font>, MP1 calls $0.20, CO calls $0.18.

Turn: ($0.98) T[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
MP1 checks, CO checks, Hero checks.

River: ($0.98) 8[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
MP1 checks, CO checks, Hero checks.

Final Pot: $0.98

Re: when to check down?
 

Bet turn and river. There would be alot more agression if one of them had trips.