This RAIN4 is ready for a cleaning/harvesting, and shows how low it can go in the sump water, in this case the tray is all under water. This can be done to save vertical space, or to make it dead silent, since the water draining from the tray does not fall at all and thus does not need a drain pipe attached to it.
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This RAIN4 (tm) Green Grabber® screen is almost filled in. Note the coralline on the bottom tray, which is not a problem to clean because of how much open space you have when the LED dome lid is removed. And it might look like the tray is setting on a table, but it's actually still in the sump, sitting at water level which makes zero sound.
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