So, I have decided to completely redo my currently empty 3 gallon for a new betta. I already have a new light on it ($7 clip on desk lamp from target). I will be putting in black sand and some kind of centerpiece rock (if petstore has single pieces of dragonstone I will get that) and a dense green bottom plant. I plan on putting an anubias plant on the rock. For the bottom plant I was thinking of actually breaking down some marimo moss balls and using that to cover the bottom. What are my other options? I thought about dwarf hair grass, but don't want something I will have to trim.