At What Point?

At what point do I put this player on a 5 in the hole. I'm thinking middle pair. Once again I will live and learn and store your feedback in the back of my head.

PokerStars Game #20689414802: Tournament #105779566, Freeroll Hold'em No Limit - Level III (25/50) - 2008/09/25 16:40:45 ET
Table '105779566 79' 9-max Seat #5 is the button
Seat 1: edu_zanella (1605 in chips)
Seat 2: k1nghammer (4455 in chips) is sitting out
Seat 3: Gloria_Br (5930 in chips)
Seat 4: cali617 (4385 in chips) is sitting out
Seat 5: NickyNick123 (825 in chips)
Seat 6: jandlhart8 (3410 in chips)
Seat 7: KoskosR (4645 in chips)
Seat 8: gubb_cru (1720 in chips)
Seat 9: Trumpets777 (1765 in chips)
jandlhart8: posts small blind 25
KoskosR: posts big blind 50
*** HOLE CARDS ***
Dealt to jandlhart8
gubb_cru: folds
Trumpets777: folds
edu_zanella: calls 50
k1nghammer: folds
Gloria_Br: calls 50
cali617: folds
NickyNick123: calls 50
jandlhart8: raises 100 to 150
KoskosR: calls 100
edu_zanella: calls 100
Gloria_Br: calls 100
NickyNick123: calls 100
*** FLOP ***
jandlhart8: bets 400
KoskosR: folds
edu_zanella: folds
Gloria_Br: calls 400
NickyNick123: folds
*** TURN ***
jandlhart8: bets 550
Gloria_Br: calls 550
*** RIVER ***
jandlhart8: checks
Gloria_Br: bets 1800
jandlhart8: calls 1800
*** SHOW DOWN ***
Gloria_Br: shows (three of a kind, Fives)
jandlhart8: mucks hand
Gloria_Br collected 6250 from pot
*** SUMMARY ***
Total pot 6250 | Rake 0
Board
Seat 1: edu_zanella folded on the Flop
Seat 2: k1nghammer folded before Flop (didn't bet)
Seat 3: Gloria_Br showed and won (6250) with three of a kind, Fives
Seat 4: cali617 folded before Flop (didn't bet)
Seat 5: NickyNick123 (button) folded on the Flop
Seat 6: jandlhart8 (small blind) mucked
Seat 7: KoskosR (big blind) folded on the Flop
Seat 8: gubb_cru folded before Flop (didn't bet)
Seat 9: Trumpets777 folded before Flop (didn't bet)