Angels should be introduced simultaneously. Otherwise, the first will likely claim the entire tank as it's own territory. Ditto on the mandarin. A minimum of 6 months, and preferably a year before adding one of these. This allows the copepod population to reach sustainable size. You can try to feed the mandarin, but it will be extremely difficult with the other fish as they are incredibly slow eaters. Most of their food would get stolen while they figure how to go about taking a bite. It's a guaranteed deal that they will have plenty to eat if the tank is stocked with pods. They aren't too good at eating amphipods as they have tiny mouths, though they may occasionally catch a slow moving adolescent amphipod. Copepods are their main diet. I recommend stocking the tank (and fuge if available) with Tisbe copepods as these are their favorite food. I'd add a couple of large bottles and then wait six months. You should have a good population by then, and should be able to see them crawling on the glass in low-flow areas... usually near (or in) corners. I don't have to feed mine, but after a year in the tank, he developed a taste for flake food. I try to get a flake or two close to him when I feed the other fish, and if I'm successful, he'll eat it. Getting a wild mandarin to eat processed food comes with no guarantee. Many have been successful training them to do so, but it's hit-or-miss. It doesn't take long for them to starve, so a healthy population of pods increases your chances of success substantially... or should I say... dramatically. Incredibly, even. I think you get the gist...
