6.50 mid pair 3rd level weird line,

Ok this happened last night at the start of a set and I think I played it a bit weird raising in this spot. But I don't know.

I think pf that fold/raise are very close and call is probably just behind. But advice on all streets would be greatly appreciated as well as alternate lines.

Nothing significant on villain.

PokerStars Tournament, Big Blind is t50 (8 handed) Converter on pregopoker.com

UTG (t2115)
UTG+1 (t2155)
MP1 (t2555)
MP2 (t1350)
CO (t1155)
Hero (t1435)
SB (t1360)
BB (t1375)

Preflop: Hero is in Button with 7[img]/images/graemlins/diamond.gif[/img] 7[img]/images/graemlins/heart.gif[/img]
<font color="gray">UTG folds</font>, <font color="gray">UTG+1 folds</font>, <font color="gray">MP1 folds</font>, <font color="gray">MP2 folds</font>, CO calls t50, <font color="red">Hero raises to t175</font>, <font color="gray">SB folds</font>, <font color="gray">BB folds</font>, CO calls t125

Flop: (t425) Q[img]/images/graemlins/club.gif[/img] Q[img]/images/graemlins/diamond.gif[/img] 5[img]/images/graemlins/spade.gif[/img] (2 players)
CO checks, Hero checks

Turn: (t425) T[img]/images/graemlins/diamond.gif[/img] (2 players)
<font color="red">CO bets t100</font>, <font color="red">Hero raises to t250</font>, CO calls t150

River: (t925) Q[img]/images/graemlins/heart.gif[/img] (2 players)
<font color="red">CO bets t150</font>, Hero calls t150

As played I really like how I played the turn, I wonder what you guys put villain on when he fires that weak bet at the river.

Obv. looking back at the hand missing the flop bet was pretty stupid and I can't remember my thought process at the time, except maybe didn't want to risk a significant part of my stack.