Esshup, I love to experiment with the pond, so this spring as the lilies come up I will spray them and see if the tadpoles along with the golden shiners can keep the algae away. In this crazy weather two days ago I had frogs swimming on top of the water when I should have been ice skating. So I look for a really hot summer again. The almost only underwater plants I have is the curly leaf pond weed which thins out later in the summer, plus I have 6 weed eating grass carp, so it will be up to my tadpoles mostly to keep the algae down. My English Springer Spaniel similar to yours catches frogs by the gross in the summer and is now catching tadpoles. Great dog.