Pond Algae - How and What to do?
I have a self-made (black plastic) pond by our deck with an attached waterfall and pump to push the water up, then down back into the pond. This year, I decided to put some small goldfish in the pond as well.
We have a very strange issue with algae forming very randomly. I'll drain/clean the pond and it will be nice and crystal clear for a few days, maybe a week or so even. Then all of a sudden, seemingly overnight, the pond will form a green scum and you can no longer see the fish. It happens both in the pond itself, hosing and the waterfall.
Any ideas as to why this happens and why it doesn't happen right away? Would it have anything to do with the goldfish? This has never happened before in past years, but has happened twice now this year. I don't have time to drain and clean the thing every week!
Final question - is anyone aware of aquatic life that will eat algae (keeping the pond clean or at least cleaner) that won't also be a threat to the goldfish?
Thanks so much!