You know they are hard to feed and if you get a specimen that will take frozen food this my ease the problem of feeding, BUT you will still have a few problems feeding it enough.
Manderins are very slow and easily put off feeding by very active fish, (which you have).
IMO if you have a well established tank with in excess of 75kg of LR = possible
If you have a refuge, a safe place for copepods to reproduce = possible
But it still leaves the problem of manderins really not liking being disturbed.
I agree they are lovely fish, but they need attention to detail to thrive.