By looking at your photo, it ...

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By looking at your photo, it looks like that your foaming problem is not due to hydrophobic filamentous organisms such as nocardioform or M. parvicella. I can't really see any filamnetous organism there! If your foam would be due to excessive EPS production, it would look like a white light foam, similar, but less persistent than foam caused by non-biodegradable surfactants. You may show a photo of your foam, to get more info.