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Thank uI assume these red/purple spots are cyanobacteria starting to grow.
Can you try blowing the purple spot away using a feeding pipette / turkey baster or something similar? If it appears to be slimy and can (at least partially) be blown away this is a great indicator. As long as it's only a very thin layer it might not act slimy, but the purple spot already looks a bit larger.

Thank me once we have figured out if I was right or notThank u![]()
