Nut flush loses to Full House in MTT???

[BetPreFlop]

BTN: 38,294
SB: 52,463 (Villian)
BB: 18,090
UTG: 132,602
Hero (UTG+1): 81,656
UTG+2: 16,005
MP1: 131,797
MP2: 35,006
CO: 8,981

Pre-Flop: (1,050) Kc Qc dealt to Hero (UTG+1)
UTG folds, Hero raises to 800, 5 folds, SB calls 600, BB folds

Flop: (2,450) 6c Ah Ac (2 Players)
SB bets 1,200, Hero calls 1,200

Turn: (4,850) 5c (2 Players)
SB checks, Hero bets 400, SB calls 400

River: (5,650) Kd (2 Players)
SB checks, Hero bets 5,650, SB raises to 11,300, Hero raises to 16,950, SB raises to 50,013 and is All-In, Hero calls 33,063

Results: 105,676 Pot
SB showed 5s 5h and WON 105,676 (+53,463 NET)
Hero mucked Kc Qc and LOST (-52,413 NET)

My question is if I should have bet stronger on a flush draw to get him off his fives after the flop? (I had an 8:5 chip lead and absolutely could have afforded it, I was in 16th out of a few hundred/ starting 7500) Additionally, is raising the right call on the river with a nut flush with a pair on the board. I was shocked to see his boat. Were there hints? Basically no texture because it was a rush tournament. Pretty new to online poker. Any help would be awesome!

[Pates]

Would probably just flat the check raise on the river how it has been played. Might be a bit nitty but he check calls the turn (you should've bet more imo). Check raising the river like that is seriously strong.

I would've raised the flop to 4k given the stack sizes. He got lucky to cooler you there.

[JD3lta]

Flop's fine IMO; standard. In the future, a raise on the flop is in order ("WTF do you have on the flop that can raise against my FLUSH DRAW?)... If you want value.. A shove was 50/50 to get called. Probably, an opp. folding would of been nice 'vs. a shove'. A case for a larger pre-flop raise could be made. Although given the position; you would of had to expect to of only got called by this guy an all, for value out of a PF raise. Very tricky, right play IMO, UL.

[stato_1]

JD is english your first language?

[ak2009]

Crazy hand... should have bet stronger on a flush draw to get him off his fives after the flop but still that would have been as good as it ended... pure badluck i would say...

[ktx492]

raise flop, raise turn.