Table image: There was a really big fish who was being super aggressive and punting off stacks and another fish that was calling a lot, so I had the image of also being pretty aggressive and not being afraid to make thin calls.

Villain: 18/9 with cbet flop of 80% and cbet turn of 65% over about 80 hands at this point in the session.

Holdem - 6 players
Hand converted by PokerTracker 4

CO: 100 BB (VPIP: 67.27, PFR: 23.64, 3Bet Preflop: 7.69, Hands: 56)
BTN: 101 BB (VPIP: 11.36, PFR: 9.09, 3Bet Preflop: 0.00, Hands: 48)
SB: 91.75 BB (VPIP: 16.93, PFR: 6.88, 3Bet Preflop: 2.56, Hands: 195)
Hero (BB): 233.75 BB
UTG: 376.75 BB (VPIP: 81.36, PFR: 22.03, 3Bet Preflop: 12.12, Hands: 59)
MP: 178.75 BB (VPIP: 20.28, PFR: 13.29, 3Bet Preflop: 1.72, Hands: 146)

6 players post ante of 0.25 BB, SB posts SB 0.5 BB, Hero posts BB 1 BB

Pre Flop: (pot: 3 BB) Hero has Q T

fold, fold, fold, fold, SB raises to 3 BB, Hero calls 2 BB

Flop: (7.5 BB, 2 players) 8 T 8
SB bets 5.25 BB, Hero calls 5.25 BB

Turn: (18 BB, 2 players) 4
SB bets 9 BB, Hero calls 9 BB

River: (36 BB, 2 players) 3
SB checks, Hero???

Unless villain is a major station and will x/c here with AK, worse top pairs, or like 66-99, I frequently check back here and just take a note.

It doesn't look like villain has much here - his line looks like autobet paired flop, random double barrel because you can't have anything, not going to pull the trigger on a third barrel with A high). He's folding his air to a bet.

This type of tight-passive regfish will often x/c Tx and JJ-QQ on the river. Because he seems so nitty pre, most of his Tx hands are beating you or chopping. So although I think you are ahead of his range on this river, I don't think you are ahead of his calling range - something like AT,KT,QT,JT,T9,JJ,QQ,99. He might not be opening T9 either (based on his stats, looks like he occasionally limps).

tldr - seems like a great spot to bluff, but you don't need to.

Edit: Basically, +1 to Verneer.

bet small for value and give yourself a cheap price in future with some of your non ax bluffs

I get what you're saying and it looks good on paper, but that last part is completely irrelevant given stakes. Every decision you make in micros should be focused on immediate EV and nothing else.

Check back, you only beat JT, T9. 22-99 might call but its pretty thin. He might even have AT, KT etc and pot controlling on river against an 8.