If water becomes polluted from either over-feeding or over crowding, then the water will have to be replaced ( if the tadpoles become less active, remain at the top and/or begin to die, this is an indication. Usually the water is particularly murky at this time too). Remove the tadpoles with a small fine gauge fish-net and place in fresh water. It is a good idea to keep some aged, dechlorinated water on hand in case this becomes necessary. Replace the main container with fresh water and then the tadpoles. Do not over-crowd the tadpoles in the temporary container for too long.

Tadpoles take (on average) from 6 to 10 weeks to mature depending on the weather conditions and frog species. Often they will leave the water whilst they have a residual tail. They tend to develop to metamorphosis (the change from tadpole to frog) to coincide with wet weather. Water lily pads and other floating or protruding plant life are useful for tadpoles reaching metamorphosis to rest on. Large leaves (umbrella plants) or broad twigs are useful to place between the edge of the container and water surface, to act as an additional "ladder" which young frogs may use to climb out by. Avoid plants with milky sap. Ideally an overhanging branch from nearby bushes will allow young tree frogs to avoid leaping to the ground where they are likely to encounter predators.