I just got back from a 5 day vacation. I have 6 tanks. One of which is a fry tank. I just got home and noticed that a few tetras were missing. I had 4 neons and 4 lemon tetras plus a few other very peaceful fish in my 20 gallon. I came home and saw some floating fish and skeletons. I realized that I was missing all of my lemon tetras and 3 of my neons. Never would have expected my tetras to die. I don’t think I lost a single other fish. This sucks as I’ve only been in the hobby for about 7 months and this tank was my first so it’s my most established. The neons were the first fish that I purchased.