I was very weary of keeping a mandarin.
My LFS had trained one to accept frozen food and was telling me their ‘bad press’ was exaggerated.
They also described the mandarin as a ‘hunter’ - if it knew there was food being added it would find it.
So I braved it - I feed a mix of defrosted brine, mysis, krill and copepods (3/4 times a day) - the LFS has proved to be correct and my mandarin takes no more of my attention than anyone else and is a joy to watch foraging around.
I do put some live copepods in every now and then too.