I agree with @JJBTEXAS
, as the tank looks a bit bare to me personally.
If no plants, then rocks and wood is what give a tank character, IMHO. Plus the sense of security to fish. The downside is more places for junk to collect and clean. With any hardscape, think of how hard it would be to reach between the rocks and branches. If buying more wood, I find https://www.bloomsandbranches.com
a good place for Manzanita (do check their sales and promo codes). 12 x 24" tall branches cost me $120 total and was enough wood 3 times over for my 5' tank. If you go that route, do trim off the smaller twigs to prevent spooked fish from getting impaled. Dremel-like tool ($20 at Harbor Freight) comes in handy for that, if you already don't own one.
As a heads up, do expect to get milky white gelatinous fungus on the new wood, it's harmless and will either go away on its own or be eaten by fish.
I do like your alternative to filter socks, it looks sturdy enough to hold some media, if need be. Mind pointing me to the source? Thanks!.
If you are looking for media bags, LiveAquaria now has them in good sizes and 2 mesh densities on clearance at < $1/ea.