Frag tank repurpose

[Texas Reefer]

I've been thinking of repurposing my frag tank and adding an anemone, to host a little clown I currently have in my DT. I don't want to add any sand. I already have BTA's in the DT and would like to try something different. What do y'all recommend? Carpet, LT, etc?

 

[Texas Reefer]

The tank is a 20L.

And tied into the DT.