First let me give you some background on the tank. 100g, 110LR, 2x Seio 620(600gph), 2x Maxi 1200, Remora Pro w/mag 3 I just started curing the rock in the tank 9 days ago. Some rocks were farther along than others when I put them in. There is no substrate in the tank(makes for easier siphoning of dying debris from the rocks) and no other life besides that which resides on the rock. I have seen a large ammmonia spike as well as nitrites and nitrates rising. I did my orginal fill with tap water and have been using tap for water for changes and top off(will continue to do so untill I see a noticeable drop in ammonia nitrite nitrate, then swith to RO/DI). I have changed over the past nine days approx. 120 gallons of water with aged mixed saltwater using Tropic Marine salt. Yesterday whe I returned from work I found the majority of the rock and floor of the tank covered in a brown algae with small air bubbles clung all over that. I was aware that during a cycle the tank will also experience a algae outbreak, but I thought it was of the green hair algae type. Is this normal? If it is, is there anything I can do to combat this or should I just keep on with what I am currently doing? Also, when would be a good time to add the substrate?