Have had my tank up and running for 2 years, never an issue with diseases. I recently added a Yellow watchman goby no QT :thumbdown:, now i think my powder blue tang might have ICH. Question is, can a PBT show signs of ich, and then hide the signs as they please? This morning when the lights first came on i could have sworn he had ich. He had bumps all over his body. No white spots, but what i would describe as cyst bumps. Now, 6 hours later, get home and he looks perfectly fine, not a bump on him. He acts fine, is eating, no rock surfing.