Male swordtails

#1
I'm not having much luck with these. The first one I bought had practically died before he got home (my fault really for not health-checking him once the shop had caught him). So yesterday I went to buy another. He had jumped from one tank to another and was very lively, so I got him. Found him this morning dried up on the floor in front of my tank (a juwel with a hood by the way). He was fine last night. Have no idea how he got there.

Really upset. :( :(

Both fish are guaranteed and can be replaced but not sure if I even want them to be now!

Rest in peace little fellas x