PokerStars No-Limit Hold'em, $0.10 BB (8 handed) from (Format: FlopTurnRiver)

SB ($13.30)
Hero ($11.20)
UTG ($8.90)
UTG+1 ($10)
MP1 ($9.90)
MP2 ($13.30)
CO ($6.40)
Button ($9.85)

Preflop: Hero is BB with 6, 9.
2 folds, MP1 raises to $0.2, 1 fold, CO calls $0.20, 1 fold, SB calls $0.15, Hero calls $0.10.

Flop: ($0.80) 5, 3, 7 (4 players)
SB bets $0.1, Hero calls $0.10, MP1 raises to $0.5, CO calls $0.50, SB calls $0.40, Hero calls $0.40.

Turn: ($2.80) 4 (4 players)
SB checks, Hero bets $1.75, MP1 folds, CO calls $1.75, SB folds.

River: ($6.30) 5 (2 players)
Hero checks, CO bets $1, Hero calls $1.

Final Pot: $8.30

Bet more on the turn please, make it at least $2.40, probably $2.80, river call looks fine.

What's the question?

Just checking up on my line here. I know my turn bet was smallish - but was it theoretically incorrect? I'm giving 2.6:1 odds and if he has a flush draw he needs at least 3.5:1 to make a +EV call and even more if he has a set. I paid him off anyway I guess. Villian had [Jc]