So i think i have a mystery guest i dont want, Im sorry i do not have any pictures to go along with my issue. My tank is only a few months old and being new to the hobby i regularly almost ocd-ly check the levels in my tank. about 2 weeks ago i decided to add a serpent star to my tank up until that point the only noticeable life in it were my two black eyed devils and a hand full of various snails, a day or so after adding the serpent star however i started to notice it looked like the stars arms wer literally breaking every few cm the entire way up from the tip, it wasn't on every arm just one, the next day one arm was completely missing bit n peaces here n there and another arm looked as tho it was breaking apart every few cm this went on for a few days while i searched frantically for an answer and also annoyed the staff at my not so local marine fish store with questions. the awnser I was given was that i was probably having flux in my salt levels causing the star to break down, but as i said i check my levels constantly and know that levels wer and have stayed at 1.023-24 the entire time. sadly the day can and my star wasnt much more then tattered arms and an intact center disk. after the passing of my star i went out and purchased a "red burrowing crap" just for a little extra clean up help, everything has been fine up untill today now, when i turned the day lite on this morning i noticed my crab was missing an eye and also on claw no sign of either in the tank, just recently during a water change i pulled what looked like a very small almost translucent mantis shrimp out of my tank. could this be an issue or is there anyone with any ideas as to what might be happening i would appreciate any info, thanks