I got some snot in my tank while it was cycling; it only appeared in one certain area of the tank, on and around one small section (4"x2") of driftwood. I removed it via water change and after the second or third "outbreak" it just never came back. I've heard of other people experiencing a similar type of "growth," especially when using aquasoil. so, my advice would be to remove all that you can manually ASAP, and then just watch it. When it comes back, remove it; I think that since I was vigilant about keeping its growth at bay by getting it out of the tank whenever I would notice it, I prevented a potentially more serious (ie larger) outbreak. I know this doesn't really answer your question, but it's all I've got. Good luck.
Oh yeah - any way you could post a picture? I'd be able to tell you if it resembles the phlegm my tank produced a while back.