Live rock dieing

Question
hey thank you so much for getting back to me the temp is at 77.9 the live rock was out of the water and placed in a plastic bag and it took me about 30 min to get home and put the rock back in the water i had the water checked out i had amonia in there before and i had the water tested at my local pet store and the water tested great no amonia or anything else in there i was told to use a prod called kent marine calcium buffer part A/B im sorry i dont knw too much about salt water this is my first tank i ever set i have kept fresh water for about 2 years thank you so much for getting back to me
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Followup To

Question -
hey people my name is jesse. I just set up my 55 gallon fish tank. I have 50 pound of live rock in there that i got from a friend of mine. He had the live rocks in his tank for about a year when i brought the live rock into my tank the purple alage on the live rock is starting to turn white im useing a 18 watt reg fra light any IDEA PLESE HELP i dont have any fish in there right now

Answer -
Hi Jesse,

     It sounds to me like a natural die off of the live rock because of transporting it from one place to another. How did you transport it? How long was it out of the water? Do your water levels as far as PH, temperature, salinity, etc. match his water readings? Get a test kit and check your ammonia level. The tank is probably cycling due to the die off from the rock. You should also get a bulb suitable for salt water use. By the way, if you just set up your tank it will naturally cycle, from high levels of ammonia, to high levels of nitrite to relatively harmless nitrate. This process takes 3 to six weeks. Be patient.
your rock will die on the suface but will come back once the tank cycles.

Answer
Hi Jesse,

    I think it will help you tremendously if you go to the www.about.com home page and on the left you will see a heading "hobbies and games", click on that heading and go to next page to find another heading all the way down on the left, "saltwater aquariums", after you click on that heading you will be at the site run by stan and debbie hauter. That site is filled with just about any info you need from beginner to experienced. Find recent articles and when you click on that you will find numerous subjects to familiarize yourself with. Do a lot of studying and take your time. With your obvious concern about doing things right I am sure you will do just fine. Thanks, Gerry.