Chasing a flush draw on the flop

[rocflight]

With blinds at 50/100 and my stack at 5200, I'm involved in a hand with A9d in the big blind with 6 players to the flop, all limped.

Board comes Jd + 2 rags with 2 diamonds. I bet 200 to give the impression of top pair Jack and to set up people once the flush hits. Everyone folds to CO, who goes all in for 1700. Folds to me, is the clear choice to fold here? Also, please comment on other faults in the play.