NL50: A flush on paired board, slightly deep, the ol'min raise

[Specialwon]

Have just 20 hands on villain at 10/0/0.25, for what that's worth.

Usually the ol'check-minraise on the turn from this kind of villain means pure nuts. But there are a bunch of hands he can have here, right?
Poker Room skin
No Limit Holdem Ring game
Blinds: $0.25/$0.50
10 players
Converter

Stack sizes:
UTG: $76.75
Hero: $63.50
UTG+2: $23.35
MP1: $50.45
MP2: $44.65
MP3: $52.45
CO: $27.75
Button: $116.60
SB: $49.45
BB: $102.70

Pre-flop: (10 players) Hero is UTG+1 with A[img]/images/graemlins/diamond.gif[/img] K[img]/images/graemlins/diamond.gif[/img]
UTG calls, <font color="#cc0000">Hero raises to $2.5</font>, 7 folds, BB calls, UTG calls.

Flop: J[img]/images/graemlins/spade.gif[/img] J[img]/images/graemlins/diamond.gif[/img] 4[img]/images/graemlins/diamond.gif[/img] ($7.75, 3 players)
BB checks, UTG checks, <font color="#cc0000">Hero bets $5</font>, BB folds, UTG calls.

Turn: 8[img]/images/graemlins/diamond.gif[/img] ($17.75, 2 players)
UTG checks, <font color="#cc0000">Hero bets $10</font>, <font color="#cc0000">UTG raises to $20</font>, Hero gets ready to pull the trigger then realises that board is paired</font>,