Hey people so I work at Petco and have my own saltwater tank. When cleaning one of the tanks I saw this guy and have no idea what it is kinda looks like a saltwater slug or a marine leech but can’t tell it’s like black or red. Anyone know what it could be?
Assuming it's round, a cuke would be my first thought, though I'm struggling to tell much from the pics at the moment - OP, any chance of closer up pics under brighter, white light?
Is it round like a tube, or is it flat/flattened? Can you describe the texture?