I have a arowana. It's tail was infected. Tried my best to save it's tail. But unfortunately it lost his tail ;_;. I added antibacterial in the tank and he's swiming actively but swiming slightly head down tail up. I lowered the water level and also added salt but it has not worked. Since it was not eating I added metronidazole but it also didn't work. Now it hadn't eaten for 4days. Please help me out what to do.