[FallenLeif]

First, the plants won't grow very well (the ones on top and any that you add into the water) because they need nitrogen and phosphorus which can be obtained from fish and invertebrates waste. I would recommend adding a nerite snail and maybe a couple of shrimp (neocaridina davidi), because it looks like you have enough space but you would have to monitor the water parameters, and more importantly because it's so small, keep it in an area where the temperature is not going to change too fast. If you are putting aquarium plants in I would recommend a small java fern attached to the rock (they are rhizome plants their roots stay above the substrate).