Not the best pic. This is when the false bottom was installed and I'd started putting in aquarium substrate. I used some old Fluorite Black Sand. You can see the Poret foam on the right side that filters the water before it goes back under the false bottom to the pump.
This is a high as the water will ever be. It can of course be lowered, since any plants I have in there will be perfectly fine growing as emergents. You can see the pumped water breaking the surface on the left. I've also since replaced my DIY pendant LEDs with a Beamswork DA 6500K 0.50W Series LED Pent. It looks better and doesn't leak light out the front.