Hi everyone, I have a guppy, his name is Chad. I have had him for quite a while now and just a day ago, I noticed he had a lighter round patch in the middle of his tail. Within half an hour of noticing it, a small part of his tail had fallen off! I went to my local aquarium to ask about it and they said to add melafix and it would fix its self and be all fine but the next morning a whole hunk of this tail was gone! Just two days ago, I got a new guppy in my tank. I am not sure if this is correlated. My ammonia, nitrates and ph is all good, I also added some antibacterial (melafix). I also moved him into his own tank. Please help, I am very sad for my guppy, it has happened extremely rapidly! Will his tail grow back?