White foam/bubbles of the water surface.

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.

strollo22 said:

Similar problem I'm having that i believe is also die to protein build up from feeding shrimp. Picked up some pollack today and I don't see any foam.


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never had the problem when I was feeding my fish talapia.