common situation: midpair check/bet turn?

[Scipio]

How do i play this hand against
a) loose aggressive
b) loose passiv

If bet, how much?

Poker Room skin
No Limit Holdem Ring game
Blinds: $2/$4
3 players
Converter

Stack sizes:
CO: $298.35
Hero: $400.00
SB : 400.00
BB: $359.95

Pre-flop: (3 players) Hero is BU with J[img]/images/graemlins/club.gif[/img] 8[img]/images/graemlins/club.gif[/img]
CO calls, <font color="#cc0000">Hero raises to $16</font>, SB folds, BB folds, CO calls.

Flop: 8[img]/images/graemlins/heart.gif[/img] 3[img]/images/graemlins/club.gif[/img] T[img]/images/graemlins/diamond.gif[/img] ($36, 2 players)
CO checks, <font color="#cc0000">Hero bets $24</font>, CO calls.

Turn: 5[img]/images/graemlins/heart.gif[/img] ($84, 2 players)
CO checks, Hero ???

EDIt: Converter mistake