What oddball suggests.. this is why I swear by HOB's with my spineys... at least until they are to big to fit into an outflow. sassy buggers! I keep the tank level low enough they can't jump into the HOB .. after a few weeks Ive never had an issue then raising the water level back up. Sorry for your loss... I think everyone who keeps Spiney's has hit that wall at one time or another with these crazy fish. And anyone who hasn't had issues with these fish is either Lying.. or has a horseshoe stuck somewhere... or maybe Oddball... lol
Hopefully shareing these trials will help others not make the same mistakes we've made.