I have had my mandarin in my 75g reef with 20 sump (allowing for the sump not being filled to the top and the size of the fuge chamber, the fuge is prbably about 5g of water) for 2 years. I tried to train her to eat frozen while in QT, and while she picked at it a little she was losing too much weight, so I gVe up on that.
She does fine in my tank as-is, but I did make a Paul B type feeder for brine shrimp which I use on occassion. Particularly before vacations as insurance. I also have cultured pods in a couple of pretzel jars to supplement, but evntually those cultures crash, so that is not a steady supplement either. I think she is fine without the feeder or culture, but I like having options to give her some extra food.
Other tankmates are: ocelaris clown, flame hawk, one spot foxface, randall's goby. I also had a flashers and a fairy wrasse in there at different times, but both jumped (I have a full canopy). So no direct competition for pods.