Need some very good advivce,Please!

[rs11]

I have had reef tank for approx. 4 years that was doing great, corals growing, coraline growing nicely.  About 6 months ago I wrote the group about my hard corals starting to die. Here is a synopsis on how it happened; first all of my snails died. Then slowly my hard corals started to shrink back from the skeleton. I tried dipping in Tectra D to no avail.  The polyps that where on the rocks died,there were many,all colors. My present water Readings are:pH 8.35, Alk3.5, phos .5, iodine .05, calcium 375ppm, Specific Gravity 1.024. temp around 84F I have a 65 gallon reef with a 15 gallon sump. An Amiracle 100 skimmer. I use a 300watt MH 10K  along with 2 actinic bulbs and a Coralife Trichromatic bulb, all about 1 year old now. I have at present 3 toadstool leather corals that are opening nicely, part of a button coral, a finger Coral and some mushrooms. All appear to be good. The glass shows a lot of algae growth, green and purple in color.I have to scrape it once a week The live rocks also have a green algea growth very low,covering them. Feels like moss, The coraline is gone I have about 2 1/2 inches of aragonite on the floor I have used reef crystals and change 5 gallons per week. I used  the following suppliments from the start: Seachem Reef Iodine,Reef Calcium,Reef Strontium. Used them very inconsistantly. I changed to Tads iodine, KLH and vital gold, on a consistant basis.Changed to this based on the praise I heard on various groups and started to drip Kalk.That's when things  started to go wrong.presently not using any suppliments. I also have a  30 gallon tank in the garage that replenishes the water as it evaporates, through a tube. I use the Tap Water Purifier by Aquarium Pharm.I have recharged them a few times myself. My question is, I want to start building up the reef again. What are your suggestions ? Do I throw 120 pounds of live rock out and start fresh ? How do I get rid of the algae on the rocks? What suppliments do I use, what manufacturer? I have bubble tip anenome that is doing great, the fish are doing fine. I do not want this to happen again. Any suggestions would be appreciated. Thanks Bob Stuhl --------------------------------------------------