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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This RAIN4 is getting started, and looks like it has 1 light running in the middle. The dark slime (from high nutrients in the water) is holding on to the Green Grabber screen as best it can, but still needs cleaning/harvesting every 3 or 4 days until lighter green hair growth can get rooted in the screen. Waterfalls are no match with bubble upflows when dealing with slippery dark slime, but the porous 3D printed screen will hold more of the growth than the old style knitting canvas screens will. This slime situation is a great application for our new Slime and Heavy Growth screens.
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This is an established RAIN4 standard stock flat screen, showing the newer hang-tabs at the top, ready to drop into the display to feed the fish.
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