nah don't move them just get more of them! You could get quite a few in there and the more you have the more active they are and won't hide too much. Or if you do put them in a smaller tank try them with sand and see them flicking around like muppet snakes at dinner time.
Mine get live food a few times a week - various worms and larvae from my bug pond, microworms, snails from the snailery. Other times they get thawed bloodworm and brine shrimp and dried foods: brineshrimp, flake, tiny fish food that I soak and fire in with a dropper or float it on the top, and shrimp pellets and hikari sinking wafers. During the working week they get a light snack when I get home, or a larger dinner. Then later in the evening I put a shrimp pellet or half a wafer for them. On the weekend I harvest the bug pond so they get food at different times of day. I try to mix it up and give different quantities or sometimes fast them occasionally.