I'm interested to see how the stargrass looks in an Iwagumi setup. It's one of the plants I'm considering for an iwagumi tank for my new GLA 36-L (same size as yours). It might require frequent trimming, but I think it could look pretty good.
This is my first time growing the stargrass. I really hope it will grow nicely because it was heavily infected with hair algae when I received it. Most of them end up in the bin. I only selected the healthy shoots with least hair algae on it and plant them.
I'm not good dealing with algae. Before this, I just redo all over again if there is too much algae growing. And I don't want redo this tank all over again. haha