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The algae in the fish tank is still stable, possibly a little worse.

During the water change today, I noticed that the filter was not operating properly. It was running but no water was going through. That might explain why the Vibrant is not very effective. Also cyanobacter prefer still water so perfect conditions.

I cleaned out all the accumulated gunk from the filter and reinstalled it. It took a while to get the pump primed and running, but now it is doing well.