It is one of my biggest leaks in game. I don't know how to play not hit board vs limper/fish.
I know I should go 4BB in this case pre. What to do postflop? Small bet, x/call, x/fold?

PokerStars - $0.05 NL (6 max) - Holdem - 6 players

BB: 67.8 BB
UTG: 111.8 BB
MP: 121.8 BB
CO: 89.6 BB
BTN: 99.2 BB
Hero (SB): 146.2 BB

Hero posts SB 0.4 BB, BB posts BB 1 BB

Pre Flop: (pot: 1.4 BB) Hero has Qs Td
fold, fold, CO calls 1 BB, fold, Hero raises to 3 BB, fold, CO calls 2 BB

Flop : (7 BB, 2 players) 6c 8d 3d
Hero bets 2 BB, CO calls 2 BB