Although YT maybe eating/picking/grazing, I would not leave nori in the tank overnight. I rather rub small piece of non-roasted (roasting breaks down natural and necessary vitamins) Nori from Asian market between two fingers. Little at a time thus YT will eat most before bits of nori fall to bottom. This way you can even hand feed them as I done with most fish I kept.
Believe me , it is not your camera, it is bit thin. I would hand feed Nori three times a day, even more if needed, until fatten up (no visible ribcage).
Good Luck.
Believe me , it is not your camera, it is bit thin. I would hand feed Nori three times a day, even more if needed, until fatten up (no visible ribcage).
Good Luck.