So today, after I came home from work I thought for sure the last guppy was dead. He was hanging out up by the filter, the corner of the tank, completely vertical, head up and tail down.
Took the lid off the tank and he shot off like a bullet, swimming fine, but he keeps heading back to that corner by the filter, where he will slowly drift to the vertical position.
He doesn't look bloated at all, there is no more stringy poop hanging. I haven't fed anything today. The new food (Fluval Bug Bites) just arrived but I figured I'd hold off on those for a while too.
I was also paranoid about the paper test strips so I bought a new API liquid tests for both nitrates and ammonia. BOTH tests show no trace of either! The paper strips show nitrates in the 20ppm range now. It's so freaking odd. I guess I'll just play it by ear and see what happens. I really can't explain the wide discrepancies across the different tests.
I did buy everything I need to follow the Aquarium Coop's quarantine method going forward. Since I just have the one guppy in the tank should I go ahead and treat the tank with those meds?