Visible drainage layer

[Vivariums In The Mist]

Here are a couple of options. Black out the front with black contact paper. Here is what I personally do. I use false bottoms constructed out of egg crate, with a small gap between it and front/side glass. I then put a very fine aquarium plant gravel that is darker in color to hide it. Easier on the eyes in my opinion then most drainage and definitely better then looking at egg crate. I would worry about the ABG getting saturated and even giving off an odor over time if it was sitting on bottom with water.