I had my 5 female bettas in my 36 gallon with 10 neon tetras and thanks to some wise people here they informed me that neons weren't the best with bettas due to temperature differences so I rehomed them. While the neons were still in there, the 2 of my 5 female bettas had stress stripes but they had only been with the neons for a week so I was giving them time to adjust to their tank mates. After I rehomed the neons I got 2 mystery snails which my bettas paid no attention to. So, 2 days ago I came home from work and one of my bettas (Marley)((she is not one of the bettas with the stress stripes)) was dead. Her eyes were missing, her mouth was partiality opened like she was screaming for help, and one of my snails was happily snacking on her. After this happened, I moved my females into my 10 gallon and moved my male plakat to the 36 gallon. It's only been a few days and the 2 bettas still have the stress stripes (they are behaving normally) and I don't know what to do at this point. Is there anything I can do to alleviate their stress or should I just give them some time? Thanks in advance!