I've just started a new brew (my fourth, supposed to be a Czech Pilsener of sorts) and after a slow start (I think I killed most of the yeast overdosing it with diammonium phosphate) it's bubbling through the airlock quite nicely.
Anyway, I keep getting this brown film on the top of my brew in the fermenter. The first time this happened, the airlock had also stopped bubbling so I threw the lot out - thinking that it had become infected rather badly.
Second time, I tried to rescue it - soaked a new sponge in some bleach and carefully wiped the top of the fermenter clean, and ladled off the brown stuff floating on top. Turned out to be a damned good brew.
So I was extra careful with sanitising everything - used plenty of bleach and scrubbed everything quite well. The airlock has just started bubbling continuously and now I've got that brown stuff showing through again. Is it normal? Should I be doing something different?