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William
4 months of flawless operation, and suddenly yesterday it started overflowing sharply - 5 minutes and the cup is full. The water level is at a minimum - still pouring. I could only stop the foam by completely shutting off one of their air valves. Nothing significant was changed in the system yesterday - except that I added 2 kg of live rocks from another aquarium and replaced 2 SanSan pumps with Vortech. What could be the problem?