You don't mention the size of your tank.
Fishes that begin to eat then stop, soon after acquisition are usually because the change has had a negative effect. This includes water quality, space, foods being fed, environment, and acclimation problems.
Not much can be done to sort it out. Just be sure it isn't a disease -- watch for symptoms of infection, and parasites.
A two month old tank has not matured yet and is in a state of changing: The Mature Aquarium I'd say you were lucky with the Damsel in there, before any fish should have been added.
Create the most stable of environments as you can. If this is a small tank, then I suspect they will have caused a problem by being introduced together, to the biological system. Water quality includes much more than just the things we test for. It also has to do with the equipment you have running and the filters you have set up. You should read this post: What is Water Quality
For now, what you should do is a very large (over 85%) water change. Since this is a large water change, follow these guidelines for that water change: How to Make a Successful Water Change
See if the fish don't 'change' their behavior after the water change. If they do, perform another water change of that same size or larger, the next day.
If they come around, please start feeding them better food:
Feeding Marine Fish and Fish Nutrition
and
Getting Fish to Eat the Right Foods



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