We have a blue 5-6 m/o crayfish. He hasn’t molted once since we got him. He was in a tank with a Cichlid and a goldfish until the Cichlid ate the goldfish and got ich. I did a 90% water change. I put the Cichlid in a holding tank until he was treated(one week later). We started seeing small white worms on the glass of the tank weeks later. He’s been lethargic. He eats shrimp pellets, wafers, and peas.. there’s a cuddle bone in the tank as well. He had some stuff on his shell(not worms) which was lightly brushed off. There’s a few brownish red spots on his shell.