Troubleshooting without ...

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Troubleshooting without details is difficult but from what you have described it sounds like a classic case of process turning septic, or anaerobic, that is typical colour, should also be offensive in smell?

Cause? Well could be several from too low was rate to increase in solids load to power failure or reduced oxygen transfer rate, you should be measuring residual dissolved oxygen in the aerobic reactor and should be retained minimum 1.5mg/L

the foaming then starts as the filamentous bacteria proliferate and dominate under these anaerobic conditions,

not always easy to fix, I have a really good reference if you require

regards

gary