This is a really tough spot just because we're out of position against two of the players.
But i agree with above. I'd bet between $3-$3.50 on the turn. Hopefully the players behind you fold. Depending on how many people call, and what the river is...
ALso, if one of the players behind you raises you, I think you have to fold. AJ is losing to AK, AQ, and AT here.
Also, out of all of the callers on the flop, at least one of them has to be on a flush draw, and will probably fold to your turn bet.