So I am inbetween apartments, my lease starts June 1st, and I brought my axolotl, Zero, home with me to my parents. He has a little vacation tank there, which, without my knowledge, my mom filled with guppies while I was away. She moved most of the guppies out of the tank and left 4 in there for Zero's arrival. He ate 3 while he was here. He's developed red toes on his two hind legs and a red patch on the underside of his tail tip and his tail tip now has a little crook in it. Hopefully the 4th guppy just nipped him a couple times (I moved him out), but I'm worried it might be red leg bacteria. How do I treat this? I can't take him to a vet, I'm a college student and I can't afford it. I was going to try melafix, and if that didn't work, when I move to my new apartment I was going to fridge him. The water parameters are all normal but I performed a 20% water change just in case.