Hey, So our tank is perfect (levels checked) the other black fishbone are doing great but one is looking brown ! Any clues what to do or what’s wrong?? Thought he may have shredded his shell as found only half a one round the back but now looking I’m not so sure! Should I move him out? Is he gonna die ! 😭 🦐 Any advice is so appreciated. Anyone had this? Super strange and google my friend has come up with no results!