hi I am new to this forum? I have 4 Goldfish and an eel . I recently found out my tank was too small to carry my fish. anyhow My one fish is sick.. My other fish named Mucho is a boy and He has those ... Tubureacl or Somthing like that on him lolololol i'm ne at this hobby so 4give melolol... But what i was wondering was is mucho picking on my weaker fish or is goldie a girl and Mucho a boy??? help please i don't want Goldilox (goldie) for short to die- or get hurt

thanx