good spot to 3barrel ?
are my sizings ok ?

PokerStars - $0.50 NL FAST (6 max) - Holdem - 6 players
Hand converted by PokerTracker 4

BTN: 100 BB (VPIP: 31.11, PFR: 20.00, 3Bet Preflop: 9.46, Hands: 188)
SB: 120.36 BB (VPIP: 26.67, PFR: 26.67, 3Bet Preflop: 0.00, Hands: 16)
Hero (BB): 231 BB
UTG: 142.16 BB (VPIP: 29.05, PFR: 23.03, 3Bet Preflop: 9.21, Hands: 184)
MP: 172.5 BB (VPIP: 29.76, PFR: 21.43, 3Bet Preflop: 9.68, Hands: 86)
CO: 104.02 BB (VPIP: 19.52, PFR: 16.19, 3Bet Preflop: 8.60, Hands: 218)

SB posts SB 0.5 BB, Hero posts BB 1 BB

Pre Flop: (pot: 1.5 BB) Hero has A J

fold, fold, fold, fold, SB raises to 3 BB, Hero raises to 9 BB, SB calls 6 BB

Flop: (18 BB, 2 players) 3 2 7
SB checks, Hero bets 5.98 BB, SB calls 5.98 BB

Turn: (29.96 BB, 2 players) 9
SB checks, Hero bets 19.06 BB, SB calls 19.06 BB

River: (68.08 BB, 2 players) 8
SB checks, Hero bets 57.56 BB, fold

Hero wins 64.68 BB

It's fine. NH

I'd probably go smaller OTR like 44bb since we want to be value betting 1010+ here, and going that big just polarizes your range to nuts or complete air.

A bit too aggressive for me but that's just me. I guess I just have problems putting him on anything that's drawing or anything. Was he going for a K high flush? A gutshot straight? Hard to say. Anyway as played its fine, just now how I would play myself.