Thevectra
Hi, I've been brewing Gordie Yorkshire Bitter for well over a year and I am now just getting a thin opaque film on the top of the brew at the end of ferment. Also, the secondary ferment is all but non existent and the beer, although drinkable, has a slight acidic taste. I only have 5 elements, the malt extract kit, yeast (no change from the perfect brews) sugar, brew bin and of course water. I changed the brew bin and used new yeast, but I'm still getting the film. I have attached a pic. Any suggestions? Thanks.
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Steve
Looks like pellicle to me.
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Fermented Culture
That's called a pellicle: http://www.milkthefunk.com/wiki/Pellicle

Unfortunately it's not possible to tell what has infected it by looking at it (yeast/bacteria/other?).

How long do you leave it to ferment? Is the fermenter airtight or do the rubber bands let air ingress? Has the temperature probe been sterilised and is the wire sanitised? What is your cleaning regimen?

If it's not air tight you can poke a hole into the top with a drill or hot screwdriver then insert a grommet for the probe.

When you say secondary ferment do you mean for carbonation? Sometimes a low pH can stop secondary fermentation but since it's only slightly acidic it might be another compound (some yeasts are "killer" and stop the growth of susceptible strains while others produce other anti-fungal compounds).
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Fermented Culture
Having a second look it looks like the krausen reached the rubber bands and wires, could be another point of contamination there.
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GHW
If you don't have a lid on the fv I'd suggest one. Maybe something airborne getting in there?
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