Need help identifying algae! Please!

I have something strange going on here in Portland in my 800 gallon water feature. It is this strange algae that grows on everything like a brown rubber. I do not know how to killl it and need help. It traps bubbles under it while growing.

Overview

There is no fish in this pond. It operated smoothly for years with no strange algae until this last winter. It gets early morning sun until 1 pm daily. The pump is 4000gph/hr and it is 800 gallons. I keep this pond very clean and the water tests great. Its like it has an infection. When i drain the water and spray the algae with hydrogen peroxide, the peroxide actually sizzles and bubbles! I have tried nuking it with algaefix but it just comes right back. I have also hit it with sodium percarbonate and hydrogen peroxide but nothing seems to really do the job. It incases all my plants amd basically suffocates them.

Fish / Plant Stock

No inhabitants currently
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cody
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