in the vase reef it's just with an airstone. But this is a whisper 100 meant for a 100 gallon tank going into just a one gallon vase...it has to be bled off with a valve to get the flow just right. Since the vase has a plastic lid that fits exactly on the inner diameter of the vase neck, all the splatter is directed down into the bowl, with no saltcreep, and the result is evaporation restriction that takes the gallon vase out to a three day topoff window, as good as any large tank so it's very stable. This is fully repeatable and verifiable by anyone, a trip to wal mart will do. get a large glass vase and then a plastic lid from the garden center meant to hold potted plants. Invert it, it will sit right inside the vase that is 90% of the entire design.
The square tank has a continuously lit refugium that constantly pumps oxygen when the light is on. It is lit separately from the display lights so it can go opposite of them through the night cycle, when the dark corals up front need oxygen the most. since the square tank is sealed, it does not ever evaporate and it runs at 1/2 gallon due to this design element. See how there is a black metal clamp in the center of the tank to hold on the lid, which is pressed against weather stripping?
