yes never add that much at one time you are just asking to kill everything.
did you cycle your tank?
decide on your filtration and lighting?
mandarins need a well established tank loaded with pods to survive (at least a year old or more). kole and hippo tangs also need an established aquarium with lots of alge growth and stable water quality. they are more of a delicate fish, very prone to ick and lateral line disease you need to learn the care and special needs of these fish to keep them healthy. and any anenome also needs a established tank also and should be kept only by the most experienced reefers. in the wild they can live longer than humans, in the tank most dont make it a year and thats if your lucky. before buying fish there is a lot to find out about them. size, min tank requirements, level of care, feeding habits, aggressiveness, and compatability. one thing you will learn is this is not a fast hobby the faster you go the more bad experiences you will have. the slower the better.