My best guess is that my ryukin has hemorrhagic septicemia; bloated, mushy rump, raised scales, floating problems, etc. I'm searching for info on the best antibiotic to treat it and found recs for Kanamycin, ordered Kanaflex, but won't arrive til Tuesday. Before finding that i ordered Amoxicillin and it arrives tomorrow. Petsmart has Erythromycin available. Anyone with experience in successfully treating this with antibiotics who can guide me?