[Goldeye]

The real question is "does pushing the tubes qualify as herding."
I voted that it's legit, but in hindsight, the answer is a little more complicated. If redabot is pushing the tubes in such a way that they all end up neatly in an easily defended corner, there's a good chance they are in some way guiding the tubes, and that would probably mean herding.
However, the rules don't specify a penalty for possessing multiple tubes.

At any rate, under the intent of the question and the wording of the rule, it's legit.