We caught two tadpoles yesterday and they are in a tank with the water along with sticks and dirt where we got them from. Is this a good idea? It's free standing water so it's not downstream of anything. The dirt does not seem to be settling very much so we want to make sure they are in "good" water. Should we remove the dirt and put something else on the bottom, or leave it empty except for the above water section for when they are older?

Thanks!