Brown Jelly Disease

[sanderson417]

I just came home from a business trip and half of my torch coral was covered with brown jelly disease. I siphoned it out and removed the half of the torch, which was infected. Questions: why did I get this disease? How do i get rid of it? How do i make sure it doesn't return? Recently I started losing heads, so I reduced flow, thinking the issue was too much flow on the torch. I googled brown jelly disease for hours last night, but I can't find what caused me to get it.