Nice!
Thanks for the info and the pointers. They are smart and interactive indeed. I think all spiny eels are.
That's pretty good rate. Through the years I've tried my hand at a half a dozen of fire eels. It has been very hard to feed them. They are fussy. I've learned they accept easily only crustaceans and worms.
My prior attempts met with demise for various reasons. Last fall I got two ~10" from Pet Zone San Diego, CA. One would not eat anything, not even bloodworms, nothing, perished in a few months. Even live ghost shrimp didn't help. Another I tried much harder with and it is eating ok, got some bulk, but barely grew, still at ~12".
I've got 4 black spots and two tiretracks at the same time. Very easy. They are ~1.5' right now and very thick.