A wet/dry type drip tray with a horizontal screen.
With the light on bottom pointing up, at a screen. Algae would grow in down like stalagmites.
Prehaps even self slough off when it gets too long and heavy.
Mostly curious as my top tank is next on my to do list.
I am going to build a filter floss box, similar to a wet/dry filter top
I would like to do a algae scrubber incorporated to save space on the top of the 75 gallon tank.
Thanks for any help..