Some more info ...
When I said it collapses, I was serious
Skimmer is currently 'bubbling' as if it was a mix of vinegar and baking soda, without the overflowing of the volcano
No foam at all, just lots of bubbling
With it's track record, if I were to turn it back up right now to get some foam, by morning it will have filled the cup, or overflowed into the sump
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