So I'm planning on making a stand but using only 2x4's. My tank is a Mini-L with the dimensions: 45cmx27cmx30cm (approx:18"x10.5"x12"). My question is: without adding a plywood top, would the tank be safely supported with just the outer edges of the stand? Also, what's the highest I can safely make the stand if the stand were to be made close to 18"W x 10.5"D?
With a rimless glass tank, or acrylic (I believe), you really need a flat surface beneath it to prevent bowing of the bottom pane. I would definitely do a plywood top on it, and then your "garden mat" for $30
a $6 roll of black slip-resistant drawer liner from HomeDepot, enough to do about 3-4 custom fit rimless mats, and about 99% identical material