"Doghouse Riley" wrote in
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It's often difficult to get a natural balance in a small pond, the
effect of sunlight will turn it green and may even make it go "soupy" so
you won't see your tadpoles.
Doghouse Riley

If a small bag of Daphnia bought from a local pet shop (fish dept) will,
when introuced to a small "green" pond, soon have the effect of clearing the
water. This depends on there being fish in residence to gooble up the algae
gorged daphnia.

It really does work.

Bill