Remove the screws- except for the one that got stuck and wouldn't let go!
Gently pry open the two halves- except that the peg and socket holes at the front got stuck and finally broke!
And we have... fillet of fish!
The tail movement uses a simple gear motor and a cam.
I had to cut and pry through some glue before the motor case could be removed. It was pretty well sealed for water tightness, but that's not needed anymore.
I was hoping for more room inside the fish, so I could integrate the electronics for the Fish Tank. Unfortunately, it's too tight in there. We'll have to keep most of the electronics external.
More updates soon...