What do tadpoles eat?
When very little they eat the jelly around the egg; once this has gone they start on the algae on stones in the water, eventually, they become carnivores and eat the tadpoles which didn’t make it. I move the frog spawn out of my pond into a water feature with green-covered stones each Spring because the pond fish eat the frog eggs. As they mature, I add a tiny pinch of crumbled, flaked goldfish food every morning; you can watch them swim belly-up gulping down the tiny pieces of fish food. When they are bigger, I’ll move them back into the pond. Grown frogs enjoy fishermen’s maggots which you can buy at a fishing shop.