Got an outbreak of Ich
3 tetras down so far, the betta not looking good. I'll be surprised if any of them survive, TBH. The pleco is the only one without visible signs of it, although I'm fairly certain either it or the last two tetras in were the carriers.
Increased temp to 82, salted slightly. Removed snail, treating with QuICK Cure. At this point, I'm more worried about the plants. They're far more expensive to replace.