i recently noticed that my adf has a sore on his leg and i don’t know what to do. google says it’s a fungal infection but i think it might be a wound from my goldfish. i first had him with my betta and he would attack the betta so i put him with my goldfish. but then the goldfish started attacking the frog :/ so idk if this is an infection or an injury from the goldfish. he can’t use the leg when he swims. after i noticed i moved him into an empty 55 gallon i’m cycling because i had no where else for him. i just got a half gallon plastic tank because he can’t swim well and i don’t want him to struggle to get food. i’ll attach a picture of the leg. please let me know what i should do. do i do nothing and let it heal? do i buy something to treat it? or do i have to euthanize him? i would never want to do that but he can’t swim also, if it is an infection, will i be okay to finish cycling my 55 gallon? will this hurt future fish i add to the tank?