I have a tight image.

Villain has been doing shady moves.. calling 6x BB preflop raises pre-bubble when he has extra chips to play with .. limping and min raising lots on bubble..calling bets postflop here and there and folding sometimes.. he has an aggressive image.

$1 knockout SNG 9 players

Final 3:

Chip leader: 5.5K
2nd (aggressive dude): 4.5K
me: 3.5K

Blinds 80/160 , ante 10%

I am on big blind.. the SB limps (aggressive dude) , we see a flop

6KT flush draw .. I bet 165 (a bit less then half pot), he calls

turn is 7 showing double flush draw

I have T3o

I shove all in to protect my 2nd pair I'm assuming he's on a draw. I'm not sure what to do here really.

He calls and shows KQo , no blockers.

Not knowing his hand.. is this a bad move or a good move long term.

So you push 3k on about 700 pot?

Inviato dal mio ONEPLUS A3003 utilizzando Tapatalk

This is certainly an Overshove.
If you believe he was on a draw and has no K, make a well sized bet (maybe 500), but certainly don't shove 4x pot there. On any unimproved river check behind since there's not many worse hands you get value from (maybe 6X or 7X if he is pretty bad). In $1 KO STTs your edge should be big enough to not risk it all in a relativly marginal spot.

Check the flop!

A very aggro dude who checks a dry board should ring alarm bells, esp. if he always bet those before. And 2nd pair no kicker is a hand u should want to be in a flop checking rather than betting range anyway, especially under the given conditions.