Algae below waterfall

[BarbAZCA]

I have a small 600 gallon pond/waterfall with goldfish. After modifying it (adding depth & vertical sides to keep out the raccoons), we refilled it and also added lots of plants. I expected the granite rocks lining the pond (with a rubber liner underneath) to gather some moss/algae. Now that it's summer in the mountains of AZ I notice a thick patch of algae accumulating on the bottom of the pond (3' deep) beneath the waterfall. And the filter pad needs to be cleaned daily to prevent cloudy water. Any idea what's causing this? I don't want it to get out of control and take over the entire pond. Water is clear, plants doing well, fish are happy. I don't use any kind of water treatments.

 

[Lisak1]

Is it attached to the rocks or floating freely?

 

[BarbAZCA]

Is it attached to the rocks or floating freely?

Tried to skim it up with pond net. Didn't come up so I'm assuming it's attached to the rocks. So far about 3" thick.

 

[Lisak1]

I'd say that's a healthy sign actually.

Do you have a good number of plants in the pond? Fish?

 

[GBBUDD]

What was it that killed algae on a waterfall peroxide was it ?

 

[Lisak1]

Yes - but this sounds like it’s underwater algae.

 

[BarbAZCA]

What was it that killed algae on a waterfall peroxide was it ?

Yes, I also have string algae forming on the waterfall - don't want that in my pond. My goldfish aren't big enough to eat it all. I'll once again check out peroxide - always try to keep 'chemicals' out of the water but sometimes need to resort to that.

 

[BarbAZCA]

I'd say that's a healthy sign actually.

Do you have a good number of plants in the pond? Fish?

Lots of new plants that are thriving. 11 one and two year old goldfish. The algae is attached to the rocks and spreading. I don't want it to get tall and take over the pond -- I'll continue to watch it.

 

[Lisak1]

I can't imagine it would grow tall if it's actually algae. Can you get a picture of it by any chance?