Well, being you already got the animals in the tank, I would suggest getting a BIG bottle of this:
Instant Ocean Bio-Spira Start Up Nitrifying Bacteria Aquarium Additive at PETCO
Put it all in, and it should help. Make sure you do a five gallon water change every 2 days until the tank is cycled. Good luck!
I have done what you did, and I lost all my fish because I just didn't know. Most LFS
will not guarantee saltwater fish, so you will be out of the money if they die. I hope they do not die and it can be corrected, but it's going to take a little more work on your part.
As stated before, you need more rock. This will give the fish more room to hide when they are stressed, and also your bio filtration will be better. You do not need to buy the expensive rock as you got enough to seed the other rock now, you just need to buy at least 15 or 20 more ponds of dry rock which will become live overtime.
Also if you have a friend that has a tank already established, see if you can get some of his filter material. See if the LFS
will give you some of their filter material to put into your filter. This will have the good Bactria already on it and will greatly increase your fishes chances of life.
We all have made rookie mistakes, that's why we are here on this website. To help others not to make the same mistakes we made. So don't be upset if some here seem upset you didn't listen. We get new people here all the time, and they all think the same. It always ends up the same, we just get tired of repeating it. LOL
BTW, The fish are very gorgeous! Please take our advice so we can save them and give them the best possible life they can have for years to come! We don't want you getting upset because they die out of nowhere. This hobby has its ups and downs, I have already had 2 clowns, 1 flame hawk, and one Six Line Wrasse die on me. They jumped out of my tank! So no matter what you do, sometimes fish will just do unexpected things and you will lose one or two. It sucks, but it's are job to minimize that risk as we choose to take the animals into our homes and care for them.