Whats your play here?

Villain is TAG

***** Hand History for Game 3409419930 *****
$200 NL Texas Hold'em - Saturday, January 21, 08:49:24 EDT 2006
Table Table 64971 (6 max) (No DP) (Real Money)
Seat 1 is the button
Total number of players : 6
Seat 2: Arsen144 ( $247.69 )
Seat 3: DALVV ( $176 )
Seat 4: mbacker ( $196.20 )
Seat 5: LuckNotReal ( $243.90 )
Seat 6: Evil_Ecstasy ( $178.55 )
Seat 1: tomtefold ( $184.80 )
Arsen144 posts small blind [$1].
mbacker posts big blind [$2].
** Dealing down cards **
Dealt to Evil_Ecstasy [ Kh Ah ]
>You have options at Table 69122 (6 max) (No DP) Table!.
LuckNotReal raises [$6].
Evil_Ecstasy calls [$6].
tomtefold folds.
Arsen144 folds.
mbacker folds.
** Dealing Flop ** [ 3d, 7s, 5d ]
LuckNotReal checks.
Evil_Ecstasy checks.
** Dealing Turn ** [ 6h ]
LuckNotReal bets [$6].
Evil_Ecstasy ???

depending on a few things like his propensity to bluff the river, his pf rasing ranges and such i like to riase to 15 or so.

That's bizarre, but the pot is small so I don't think your decision here really matters a whole lot. I'd probably just fold and move on to the next hand.

If he was interested in bluffing, I'm not sure why he would decide to show weakness on the flop, then make a weak bluff on the turn. It's also somewhat suspicious how he checked the flop to begin with, given that you say he's "tight aggressive." Does he not make continuation bets? It's possible he may've flopped a set (perhaps 7-7), attempted to trap you, and is now betting out for information since he's concerned over the 4 card straight. This is just speculation, though.