I have an idea to convert my sump to a large flat algae growing area something akin to SMs new floating scrubber but much larger.
I'd have a false raised bottom/screen with a rough surface & with nylon ribbons attached and air/water mix provided by air pump &/or small power heads with venturis. Light would be provided by led grow bulbs in pendant fittings suspended above.
The idea being to allow the algae to grow in 3D, across a wide area, providing a refugium for pods & what have you and also to export nutrients by the occasional manual removal of some of the algae.
Pitfalls?