I've made a million of 'em. Here's the best: most stable, functional and clean.
You can use any (safe) base; wood, plexiglass, resin decoration.
-Drill 4 hole on each side and use...the magic product-black rubber coated wire hangers! Cut to size and shape. Run it underneath for support and each end goes through the opposite hole. I have them bent over the sides of the tank, underneath the screen which fits right over them.
-You can counter-balance and length each side accordingly.
Black ones are like gold to me. I buy them whenever I see them, because it's hard to find black and I have had to use blue and white in the past
Hope that helps!