Help w/ river line / Straight on paired board facing min-bet

[martindcx1e]

Thinking back I should've raised more on flop/turn right?

PokerStars No-Limit Hold'em, $0.25 BB (9 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

CO ($9.65)
Button ($16.45)
SB ($24.25)
Hero ($23.60)
UTG ($25.70)
UTG+1 ($45.40)
MP1 ($17.05)
MP2 ($24.75)
MP3 ($6.25)

Preflop: Hero is BB with 6, 3.
3 folds, MP2 calls $0.25, 3 folds, SB completes, Hero checks.

Flop: ($0.75) 4, 2, 5 (3 players)
SB bets $0.25, Hero raises to $0.75, MP2 folds, SB calls $0.50.

Turn: ($2.25) 2 (2 players)
SB bets $0.25, Hero raises to $2, SB calls $1.75.

River: ($6.25) 3 (2 players)
SB bets $0.25, Hero ?

[bdawg56kg]

raise plz. $2.50 - 3 sounds good.

[Fnord]

raise plz. $2.50 - 3 sounds good.

[martindcx1e]

raise plz. $2.50 - 3 sounds good.

How big of a rr do you call here?