This is my 2nd Walstad in fact, definitely need more plants I know. Put some L. Repens and H.Polysperma in behind the wood, only tiny cuttings so far but they always grow super fast for me. Other than that the only thing that's changed is some massive duckweed growth, it's close to covering 2/3 of the tank now.
I know, slow progress!
Not sure about adding pothos, may add some emersed plants once it develops a little. It's a north facing window so maybe I'll even wait until the summer so they can benefit from the natural light.