I am guilty to once owning a mandarin. I did have a pod population and even bought the small bottle of live pods
that I would introduce into the tank several times a week to help them reproduce. The mandarin only lasted a couple of days. I have been searching for one that eats frozen. I went to a lfs
last weekend to see if I can finally bring one home, and the gentleman stated he has been in the tank for about a month and is fat and eats frozen. I asked him to feed him in front of me just for proof. The mandarin didn't even budge or eat at all. I left empty handed obviously. That's my next fish once I get an excellent population. I used to see them all over the glass and on my rocks. I haven't seen once since. This was 2-3 months ago.