'Looks like a nice option.
Pump noise and cleaning:
As for the pump suctioned to the bottom, there is a good way to help with issues of noise and pulling it back out.
In larger sumps, they rest the pump on silicone cooking pads as well as have the pump connected to food grade silicone tubing that attaches to the main return water pipework.
In this application of nano tanks, you can place really-really coarse foam beneath and around the tank's return pump.
The subject of sump chamber mulm and dead materials:
- with a few mm of space below the pump/sponge, a riser (upside-down crown) made of just about anything aquarium safe can be a good start.
- a few mm of space is lost in a tall chamber, but the accessibility of the pump is there for maintaining a clean chamber and more.
- vibrations from the pump are drowned out by the surrounding DIY jacket of foam around the pump.
- if your really creative, you can get the pump to actually hover off the bottom, squished lightly with the jacket of foam.
Post note LED light.
True lumen has some ultra flats 10 inch strips that have a gorgeous color hue to them that may fit in the hood space.
Model 1635 TrueLumen LED Strip, Rose Red/12K White 2 - Rose Red LEDs 2 - 12000K White LEDs 10"x0.5"x0.1"
Model 1634 TrueLumen LED Strip, Rose Red 4 - Rose Red LEDs 10"x0.5"x0.1"
They have an inline dimmer too.