UTG+1: 31/18/23/43/43/5k -13bb (vpip/pfr/wts/w$sd/wwsf/hands);
AFq: 41/45/30;
AF: 2.2/2.7/2.3;
rf EP30
fold to 3bet EP OOP 29
fold to cbet 3bet pot 66/45(11)/33(3)
ch/r 4/9(11)

CO: 23/15/25/53/48/4k +7bb (vpip/pfr/wts/w$sd/wwsf/hands);
3bet COvsMP 6
cbet 3bet pot vs 2 60(5)
ch/cl 67(3)

SB: $51 (102 bb)
BB: $116.06 (232.1 bb)
[b]UTG+1: $78.78 (157.6 bb)[/b]
UTG+2: $51.05 (102.1 bb)
MP1: $50.83 (101.7 bb)
MP2: $52.25 (104.5 bb)
MP3: $144.04 (288.1 bb)
[b]CO: $50 (100 bb)[/b]
[b]Hero (BTN): $58.95 (117.9 bb)[/b]

Preflop: Hero is BTN with 5:club: 5:spade:
UTG+1 raises to $1, 4 folds,CO raises to $3.75, Hero calls $3.75, 2 folds, UTG+1 calls $2.75

Flop: ($12) 5:heart: T:diamond: 3:heart
UTG+1 checks, CO checks, Hero bets $7.50, UTG+1 calls $7.50, CO calls $7.50

Turn: ($34.50) 4:heart
UTG+1 checks, CO checks, Hero ???

I should bet more on the flop.

I think CO have not flash since he have normal cbet in 3bet pot. Should I bet turn? Fish can have Tx, flash, over pair with heart, 2 pair, set and etc. If I bet turn how much should I bet? If somebody push is it call?