As mentioned, it's not a good choice for a dwarf angel. Pretty fish but a poor track record. Hopefully your tank is very well established with lots of live rock. Offer it much more than mysis shrimp. A varied diet to include chopped mussel, clam, greens, pellets, sponge formulas, will help a bit. I've kept two. One died within a few months. The other was going strong after almost two years and I traded it in.