Just saw that my acei has a small, white thing sticking out of his anus or vent. It couldn't be more than a millimeter long. He's eating well. As of recently, he has been hiding a lot, but he was always the dominant male. I did notice the sub-dominant male chasing him just a little bit, nothing bad. Could he be weakened from the thing or is it just a switching of dominance. He still does chase other fish and sometimes has his fins fully extended. I fed the whole tank some metronidazole food. He ate it without a problem. I used the 1 scoop metro to 5 scoops focus combination in 1 tbsp of food. Is that enough? I feed them less of the medicated food than I do with normal food of the same type. Probably half as much. I am using flake and occasionally frozen for the medicated food, which is what I usually feed them. Is that a good practice, or should I try to get as much meds as possible in their guts by feeding them normal amounts.