Slow play or not?

5-5$ PL Omaha Hi, the following hand comes up.
4 Players are at the table, I'm on the button with:

A [img]/images/graemlins/club.gif[/img]K [img]/images/graemlins/club.gif[/img]K [img]/images/graemlins/diamond.gif[/img]4 [img]/images/graemlins/diamond.gif[/img].

The first player limps, I bet the pot for 25$, everyone calls. The flop comes up:

2 [img]/images/graemlins/club.gif[/img]3 [img]/images/graemlins/club.gif[/img]7 [img]/images/graemlins/heart.gif[/img]

It's checked to me I just check.

Turn is a K [img]/images/graemlins/spade.gif[/img]

The first player leads out with a 50$ bet, and it's folded to me. Now I know omaha hi is a bad game to slow play, but should I just smooth call this bet?
ALSO should I have checked the flop or bet at it? I'll reveal what happened after I hear some opinions, thanks.