I hope this post is not to long but I detect some problems here... First lets hit the water problem, as it was posted pre to this one, RO water is best or better than tap water, distilled should be used if that is not aval. for saltwater systems tap water should be avoided, im not going to go into all the chemicals in tap water and what they do to a saltwater ecosystem. You also can buy a RO unit that produces 50 gallons a day for about 150 dollars if you still have ?s please ask we want to get you off to a good start.....
PART 2
What you should do add what first, the problem is no one does it the same if we did there would be less problems lol.. I do the same things most of time with very little change because it works. it seems you have already added your live rock i would try 50lbs per 30 gal of water,,,, the care of your tank held at optimum levels for the next 6 to 8 weeks is paramount. during that time you can expect to see a series of algae blooms (brownish diatoms and cyano this will be followed by a fliamentous green algae. This IS NORMAL.. if proper maintenance of your ecosystem is kept the algae will abate and the purple coralline algae will start to appear which tend to grow best is dim to mod light ( use an algae scrapper for the front and sides leave the colonies on the back glass undisturbed) This type of algae is important for a mini reef ecosystem. Now good coralline algae growth is a indicator that the tank is suitable for sessile invertebrates. Now you should add your snails and hermits 1 per gallon of water for your tank then add your scavengers in 1 to 2 week intervals when this is done you can intrduce fish Grammas are a good start i would start with 3, I will stop here If you need addl help feel free to ask?