So my confirmed male AGTF passed away today. Didn't show any signs of illness until today. It was spasming a tiny bit, and it's legs looked a bit green. He ate just fine two days ago, pooped yesterday. I have no idea what happened, all I know is I'm devastated. His tank mate Boom seems completely fine, I don't think quarantining is needed, but I just don't know anything anymore. The only thing I can think of is that my calcium (almost a year old) has gone bad. I'm devastated.