How does it work?

[Bluerooster]

My Goldfish pond has different pools, connected by water fall, and stream. What's interesting is that the part where the goldfish live is clear as a bell. While the pool that catches the water from the bog is full of green goo. And the stream is running clear, with a bit of string algae on the rocks.

I've done nothing to this pond in the past year or two, since I re-did the bog.
Here's the bog, and "upper pond" full of algae Bog is to the left:

Another view, Bog is overgrown, at the top right.

 

[Bluerooster]

Here's the stream leaving the upper pond:

Then, about mid way:

And then the end of the stream. On the right is where it dumps into the Goldfish pond.

 

[Bluerooster]

Then the Goldfish pond:

To the right is where the stream dumps into the pond.

Then, a view from the Goldfish pond back to the bog:

All the plants in the stream bed, are volunteer, non planted, As are all the grasses, and other plants around the edges.

 

[Laaf]

Do fish swim up the stream to the upper algae pond? If it was me, I would get a bunch of new fish for the algae pond and they can feast on it. Or catch the fish you have and relocate them to the algae pond.

For the amount of water you have, you can add more fish.

You can also grab out a bunch of the algae with a stick, rake, or net so there is less of it. I would not use an algaecide.

 

[Lisak1]

Does the algae bother you?

 

[addy1]

Nice set up!

I would put a few fish in the upper pond, or just let it be a good bio filter for your other pond.

 

[Mmathis]

Just a guess, but maybe it has something to do with water movement. Faster areas are clear, slower areas have more time to think about it.

 

[RMaynard]

Also looks like the fish pond is getting a lot more shade than the other parts.

 

[Bluerooster]

The algae doesn't bother me at all. Or I'd have removed it. What prompted the question was because all the algae is pretty much confined to the upper pond, and never migrates downstream to the other. Other than that, They both get the same amount of sun, just at different times during the day. I figure that the mini ecosystem is doing well, water is clear, except for the clumps of algae in the upper pond, and fish, frogs, tadpoles, salamanders, etc. are all happy.

 

[GBBUDD]

You said what the answer is the algae is in the first area it absorbs the nutrients before it enters the lower pond

 

[addy1]

I get algae in one of my small ponds that is fed from the big pond. This year it is full of aracharnis no algae. Works as a great plant filter for the big pond.