Hello JasonC. Here's my 2 cents. Like what the rest have said, you scape is very flat. Even with the Blyxa and Riccia, you can achieve "depth" by planting tall at the back and short in front. I would put tall blyxas more to the back and to the corners of the tank while the shorter ones (trim it if needed) will be more to the front. I would tie the Riccia to different sized rocks (big and small) and place the smaller ones in front. Surf the net for placement of rocks in zen style and see if you can apply it to your riccia rock placements. Another trick I try to achieve is to place darker leafed plants to the back and the lighter ones to the front. Usually you will find the darker leafed plants have lower light requirements (reds are an exception here). Try it.. I think you will be pleasantly surprised.