Water pressure holds it. It just slots in easily in wider tanks. Easily changed while tank is running and in situe.
Heres a video. Without the glass in front (i.e like when painted) it's a dark abyss of black.
Hard to show in video or pics tbh.
Here's an older video.
Heres a video. Without the glass in front (i.e like when painted) it's a dark abyss of black.
Hard to show in video or pics tbh.
Here's an older video.










