Either "Third time's a charm," or "Three strikes and you're out." Take your pick, but I have a Rainford's Goby in QT right now for the horse tank. To recap:
Goby #1: Died in QT after 3 days. Pretty sure not my fault.
Goby #2: Made it through QT, introduced to the horse tank, and disappeared forever. No body, no chemical spike that I recorded, just vanished.
Goby #3: THIS is the one. He's gonna make it, I can feel it. His QT tank has tons of algae on the rock, a thin sand bed filled with copepods, and amphipods crawling everywhere.
Fingers crossed.