Someone correct me if I'm wrong, but I don't think you have to worry about the tadpoles at all.

As far as I know, they won't do any damage, and once they sprout legs, you may not see them as much.

Excerpt from Robert Crais' "The Monkey's Raincoat:"
"She took another microscopic bite of her sandwich, then pushed it away. Maybe she absorbed nutrients from her surroundings."