lolz, I thought you might have a mandarin. lolz! HAHA!!
Didn't even know you did, just thought you might by the title of your post.
Sorry to say, but you are slowly killing your mandarin. If you don't have a sufficiant food source for him, such as the copepods, you are starving him to death. You should immediately get a refugium with some macroalgae and start breeding some more.