that looks exactly like mycoderma , flowers of wine. a spoilage film.
caused by too much head space and not enough so2 .
you need to rack the wine out from under the film and get your so2 up.
I'd add 1/2 tsp (50ppm) to the carboy and make sure its topped right up close to the bung.
if your ph is high your 1/4 tsp additions might not have been enough.
here is an expert from a winemaker magazine article on spoilage.
Film On Top of the Wine
1. Don’t Send Flowers
With mycoderma you’ve got trouble. It can manifest as a fine film on top of the wine, sometimes called “flowers of wine.” It and Acetobacter only grow in aerobic, or oxygen environments. This means carboys that aren’t topped up according to instructions, and wines that do not contain sufficient sulfite. Mycoderma is actually a species of yeast (Candida vini) that breathes air. If detected soon enough you can sometimes treat the wine with a measured dose of sulfite (50 PPM, or a half-teaspoon of sulfite powder per 6 US gallons) followed by racking to get it off of any mycoderma sediment. Top the wine up to the neck of the carboy, use a solid bung, and taste the wine after a week to see if you caught it in time. You may wish to re-test the wine for sulfite level and filter it to keep it stable. Then go through all of your equipment and sterilize it by soaking it in a sanitising solution and scrubbing with plenty of elbow grease. Check all of your other wines, being careful to sanitize your wine thief and sample jars between wines. Mycoderma easily spreads to other wines and is difficult to get rid of.
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