Thanks Kevin. I think I'll be happy with this for a while once it fills in. I hope my lily gets big fast.
My empty spot is to the right of the diandra, in front of the baby barclay, behind the driftwood with the green gecko crypts. Right now I'm looking at it and thinking how much I'd love a crinum (Charlie lowcoaster has them for sale). But when I think about how the plants will spread as they fill in, then I think the giant hairgrass would be better.