My two sens Nibblet and Toothless have been getting covered in lighter patches lately and it's really unusual, Nitrogens are normal (0, 0, <20) and no aggression from them or tankmates has been observed. Anyone have a clue as to what they are doing?
There are no worms, when they looked like this the Cb fish was absolutely coated. I watched this tank for a good hour before and after lights off and no sucking or biting happening, just nudging and floating around.