White foam/bubbles of the water surface.

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lix.ma14

Hydrolycus Armatus
MFK Member
Jan 7, 2011
7,182
21
92
Ontario, Canada
I notice there are a small amount of white bubbles/foam at is hanging against the tank glass. What is it? Is it protein residue left over from my fish's food? I feed my fish salmon and there is tons of oil that comes from the fish. The bubbles feel slippery. Is it safe? Everytime I do a WC, i wipe the stuff off with a cloth.
 
Maybe calcium buildups?

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