alg problems. It often happens that you have an algae problem. Firstly, it through that there is too much sunlight shining directly on the Lake. tip 1: that you would be able to fix it for free or something like that. tip 2: you can also a water lily in the pond, a water lily gives protection against sunlight. (preferably a water lily with large leaves,) Never forget your water water lily Lily with sand to legs and, of course, in a larger container. field with the algae issue. You can fix the problem by in a pet shop to buy a special substance. that often helps within just a few days!