I found a couple of large pieces of slate around my house and hammered one of those pieces into bits and used them to anchor the centerpiece of drift wood(s)...
I still have a few other pieces that are under the other piece of slate on the left.
My filter finally came in this morning, hopefully my water starts to get clearer.
As you can see, I jumped on the opportunity to unbunch the glosso and plant them in the sand. I was really just waiting for the center pieces of drift wood to come together for that. I hope they survive!