caught a slot red on a gulp sand flea. I think that the fake sand flea passed the fishes mouth at just right moment in time. I never did have much confidence in gulp for surf fishing.
Fish Bites are different thing though
I use them for bait fish as I mentioned. I'm sure, with enough determination something could be caught in the surf with them. Lady fish, and reds maybe. Reds will go after just about anything as I've experienced. Best luck I've had was with an very fast action light rod and jigging one on a j hook across the bottom of the sound. Got a fish just about every cast.