He appears to have gotten over it. The only thing I can think is that he was reacting to a treatment with Flatworm exit. The nasty little red buggers were getting too numerous for my tastes again, and I didn't want to let it get as bad as the first time, so I treated the tank the day before I noticed the CBB not eating. I didn't do a water change after the treatment, just used carbon. I did a 50 gallon water change yesterday, and another 50 gallon water change today, and he went after food today
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