| TG:
I hope Mike doesn't mind it, but ETS is a brand name of skimmers. They were the ones that started the downdraft style of skimmers and I believe Mike's is style a downdraft unless he has modified it.
Downdraft skimmers shoot water down a long collumn full of bioballs where the water splashing causes the bubbles to form when the air is drawn in from the water shooting action.
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Water is what keeps a ship floating, but it is also what sinks it.
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