With all that new water I wouldn't be surprised that the skimmer isn't making foam. What kind of skimmer is it, each skimmer needs to be adjusted in their own way so someone here will be able to tell you about the set up etc for it once we know what you've got. If the skimmer was inactive for a day or so it may need a day or two to get a film built up as well. The foam climbs the film and with out the film the foam just kind of turns over on it's self.
Doug
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