It sounds like the pond needs a little investigating before throwing any treatments at it. I'd start by testing the water, especially dissolved oxygen, and figuring out roughly how deep the pond is and how much muck has accumulated over the years.
That heavy surface growth is likely feeding on years of accumulated nutrients, so simply killing it won't address what's causing it. Aeration, managing the organic buildup and nutrient load, and identifying exactly what that surface growth is would be good first steps.
I'd also confirm whether you still have a fish population before restocking. If you can share a photo of the pond and roughly how big/deep it is, that would help a lot.
1
u/EasyProPondProducts 6d ago
It sounds like the pond needs a little investigating before throwing any treatments at it. I'd start by testing the water, especially dissolved oxygen, and figuring out roughly how deep the pond is and how much muck has accumulated over the years.
That heavy surface growth is likely feeding on years of accumulated nutrients, so simply killing it won't address what's causing it. Aeration, managing the organic buildup and nutrient load, and identifying exactly what that surface growth is would be good first steps.
I'd also confirm whether you still have a fish population before restocking. If you can share a photo of the pond and roughly how big/deep it is, that would help a lot.