i think what you're describing is a protein build up,
i've seen it happen in a lot of my friends Betta bowls. i've noticed a pattern though, i've only seen it in tanks/bowls that don't have a running filter.
if you don't have one, consider purchasing one, the pressure of the filtration may break up the surface of the water enough to keep this from happening again
i don't think it's harmful, just gross and annoying, try scooping it out whenever you spot it
Haha yea I recently contacted my local pet store and they suggested an air pump. Well I purchased one and now it keeps the water moving. It only appears when I leave it off for a day or so. Thanks anyway!
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