I dont have pics, as they werent my specimens, but I've seen numerous (5 or more) Snowflakes that were that size.
Even the ones that's arent that thick, shouldnt be kept in a 55gal. Even yours, as 30" (congrats, by the way, cause there's not alot of people that can keep them to that size), wouldnt sit right with me, in a 48" long tank.