Assassins not eating

I picked up 4 new Anentome helenas from Arakkis about a week ago and I have them in a cycled 2g hex while I get their dedicated 5g tank set up. All that's in the 2g hex with the assassins are 13 ramshorns, an HOB filter and a heater set to 75. Since they've been in there I haven't seen the assassins eat anything and I'm beginning to get a little worried. I've tried supplementing them with crab cuisine pellets but those rams are quicker to the draw and gobble everything up even when I put in veggie sticks to distract them.

Are the assassins still acclimating? I assume they should have eaten by now. I have normal parameters:

ammonia - 0
nitrites - 0
nitrates - 10

The rams are a little bigger than the assassins and are laying clutches all over the place. I've read that assassins can eat snails from 1-1.5x their size.

For size comparison:

If lack of substrate is the problem, I can fix that tonight. Thanks jackiomy!

whoa, 2 weeks? I didn't know they could go that long without eating. Well, I'm gonna make them a little more comfortable and add some gravel. As far as driftwood and bigger rocks go, that might have to wait for the 5g to get up and running (I'm picking up black sand tomorrow). I'm still sweating bullets and wringing hands over the little fellas though =/

At the rate the rams are laying clutches at least I know I'll have a strong population of rams going for when the assassins finally do begin to feed.

78 degrees, done and done