Hang it with fishing line tied to the pump in the right spots and brought up and over and hooked to the outside bottom edge of the upper frame. (wrap the line around a toothpick and shove it up between the frame and glass, then break the toothpick so that it doesn't look like a toothpick stuck up there and people wonder and pull it out...crazy but it works and is practically invisible.
The electrical cord can also help hold it in position by giving it a tight bend where it goes over the frame!
If the powerhead has an outlet that swivels the pump can be turned sideways and the nozzle turned up to shoot along the surface.
A stronger pump can be positioned behind rock near the bottom and pointed almost straight up toward the suface. This is ideal because it brings water from the bottom to the surface.
Acrylic pieces can be bent or glued just right to provide a stronger support, but they are visible while fishing line is invisible
Hope this helps.
BTW a powerhead that has no suction cups or bracket supplied may be a pretty cheap one and may not last long. Be careful because it may be so cheap that the cylinder magnet that turns the impeller can rust. This is not good!
My 2 cents
Edited by Mark Peterson