I'm currently working with Micranthemum 'Monte Carlo' in my Mini L without CO2, though using Flourish Excel. I'm not sure what the lighting levels are like on this tank, but maybe it would work for you as well. I've also seen moss carpets that look amazing, and are very easy to grow, if slow going. It wouldn't be too bad on this small sized tank at least.
I also cannot really tell from the photo, but make sure that the Anubias' rhizomes aren't buried in the substrate, else they may rot and die.
Feeling adventurous? Maybe check out my current
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