Hey ash welcome to the boards!

heres my 2c..

at the flop the pot is 1.3, first to act overbets it by raising 1.8, next to act flat calls.. pot is 4.9 and min re-raising encourages the flush draws to stay in a bit too much, especially when theres 2 ops I'd raise to at least $4 maybe even a nice $5 This also helps juice up the pot so you get better odds in later rounds.

after the turn allin pot is 13.4 so you dont quite have odds to call the $5 on your 10 outer... if you whack 5 in here you need an $18 pot to call with 10 outs http://www.texasholdem-poker.com/pot...calculator.php - sometimes i actrually wack their raise in on that site during the 20secs you have to call to see if you have the right size pot for your # of outs.

you said you were sure that last to act was flushing it and hit and would call the turn allin, in this case he helps give you odds if he calls behind you or pushes allin (which was only ~2 more if i remember rightly).

all in all this was quite a tricky situation and u made a very disciplined lay knowing one of them had hit their flush - but i would of called at the turn with almost pot odds (IF op 1 deffo has flush) and great odds if op 3 behind you comes along for the ride.