I have one too.
Bought this little guy at 10 inches and ery skinny.
I seperatet him but after one night he mace it over to the big guys.
I thought he was killed and eaten from my other fishes.
After 2 weeks i found him healthy and alive between my big fishes.
Now he lives with my big black Arowana 20 inches, Bocourti male 11 inches, Synspillum pair , fire eel , spotted gar, afro aro and my tigrinus catfish.
When i do something at the tank he comes out and search for food.
I would buy one or two more but there is only one lfs in germany and he sells them for
400 euro about 20 inches big.