I purchased what I think is an Endlers guppy at Walmart. It was the only one in a tank with a few fancy guppies. I wouldn't normally buy fish at walmart but I had never seen an Endlers in the local pet stores in my area and the tank/fish looked clean and healthy so I bought him. He is neon yellow with orange markings on his belly. The neon yellow formed 2 swords on his transparent tail but the tail had turned totally transparent by the time I got him home and settled in my tank? Is that normal?? Today the bottom yellow sword seems to be returning, he's been here almost 2 days. Also he has an antenna running back from under his belly toward his tail? Any information about this pretty little fish??