Question about planted aquarium and fishless cycling

Manually removing the pond snails will be effective only if you have also been cutting off their main food source. Reduce the amount of fish food is a must to make sure no leftover is available after each feeding. If you can solve the algae problem, it will just be even less food for the pond snails. Without so much food, they can't reproduce that quickly. Then the manual removing part will actually make an impact on their population. If you introduce a few Assassin Snails as was mentioned in the first article, they will also help to keep the pond snail population in check.