Variety for vitality! Your little Russian needs more than iceberg. Iceberg does not have enough nutritional value and eventually the tortoise starts to decline. My rule is at the very least 5 different things a day, a rainbow a day ,or 5 shades of green. And Russians are big lovers of weeds, so easy peasy. Just be sure the weeds have not been in an area that has been fertilized or pesticide sprayed.