Hi all,

For the last few days my pond fish have been sat on the bottom of the pond, in the deepest part, and don't even come up for food.

I did a partial (25%) water change and cleaned the filter 2 days ago to see if that helped, it hasn't, and it has also caused a bloom of some brown algae that has settled on all surfaces.

I don't currently have any test strips and won't be able to get any until the weekend.

Has anyone seen this brown algae before? I've had the pond for nearly 3 years and it's the first time I've seen it and the first time the fish have been inactive.

Does anyone have any ideas?

Sean