Hi, i want to ask for tips from you guys. my friend have a 13 cm black ghost knife. she put it in 120 gal or so gal for now with a 12 cm parrot cichlid, 7 cm clown loach, 7 cm redfin shark, and 16 cm tinfoil barb. about 3 days ago, on its back there is a half circle mark that consist of small...