[sc000t]

limp/raise preflop is ugly. just bet preflop and call a reraise.

As played I check the flop. Up against 3 other players and you don't have a diamond. If you had the Ad this would be a completely different hand...and much more intersting imo.

As played I think you should pot the turn honestly. Unless he has the Ad in his hand, its going to be extremely difficult for him to call a potsized bet. I think you will get alot of smaller flushes calling one street then folding to further aggression on the turn because a smaller flush won't really beat much from villians perspective. Also since he didn't reraise the flop, I'd say its less likely he flopped the nuts unless its like a set + NF.

Only other option would be to check and hope he checks a flush behind to see a safe river and keep pot small, because a small flush really doesn't want to see a c/r either.

Betting half pot is the worst option imo because smaller flushes call and bigger flushes raise