Hi, any idea what kind of thing could this be? I found it already 3 times in my quarantine tank where I have several fish now for one week with UV sterilizer and Ruby Reef Rally.. it looks like internal parasite?… according to the size (approx. 4-5cm) it could be only from Valencienna sexguttata or Quoyi Parrotfish… (second picture is body, 3rd head under microscope)… any idea?