Thanks for the compliment on my tank...
I went back and re-read the OP...
Is that solid glass or plexi you've used as your false bottom? The whole purpose of a false bottom (and the reason people use egg crate and screen) is so that water can drain through the substrate and the entire floor into the resevoir. You simply paint the front and sides black up to that level to hide it. Using a solid floor completely defeats the purpose, and you'd have to keep the tank absolutely level, or you are going to get dead spots where the fouled water pools.
Whether or not the space under a false bottom is wasted isn't a matter of opinion...it either is or it isn't. Why have a resevoir of flowing, highly oxygenated water when you could have the same space filled with bioballs or ceramic bio-media to culture nitrifying bacteria?
Also, requiring your filters to fight gravity and draw water up several inches and over the back of the tank will guarantee them a short life. The canister might do it for a few years, but the Whisper won't...they aren't made for that.





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