OH MY....I feel your pain!
15 years or so ago, we went and bought a larger tank for our Bala Sharks. I had some that were over 10" long.
When we got home I started the water conversion from one tank to another. In the meantime I'd put the
Bala's in a holding tank. Well...they kept doing "Dolphin Flips" and getting out. SO...we put a lid on the holding tank.
That killed them before the water conversion was done! I couldn't stop crying!
My husband kept saying they were just fish! YEAH...fish that I'd had for years, and they all had names and personalities.
AND...who buys a BRAND Spanking new house, and then has the occupants die! It was devastating!
I hope that you do NOT loose anymore!