Save my tank!

[jason604]

So here's what changed. About 2-3 months ago my tank was beautiful no algae in sight and my sps were super vibrant n just pops. Till one day I saw some hair algae n just left it alone. Next thing u no it my tank was had a full blown long hair algae outbreak. It began to smother zoas n sps etc but the colours were still vibrant none he less. I bought more larger sps and had no room to place it so I have to put it at the end of my tank but I'm only running 1 16" led fixture on a 4' tank so I decided to raise my lights about 5-6" higher to make sure my new colonies had light shine on them. The very next day most of my sps all browned out right away due to the shock of light I'm sure. I lowered it a few days later back to the original height but my vibrant sps colours didn't rly come back and I was stuck with an ugly brown tank filled with long hair algae. So after seeking for advice here I tried getting a reactor n filled it with about 2" of rowaphos. Then few weeks later is when I had my semi tank sps crash. I'm thinking there's something in my rocks. I did purchase a bunch of base rock and bleach/ muriatic acid bath and put my tank water in it so it will cycle faster. I'm planning to swap all the rocks in my tank with my new rocks when it's done cycling. I'm not sure if using my old tank water is a good idea to cycle the new rocks or not but so far I only did it once and didn't change the water yet. I'm planning to drain the water and fill it with my tank water again tomorrow when I change the water or should I just make new clean saltwater for my new rocks?