I would put some driftwood in there (either floating or sinking) and hang some plants on it. I know I have a large piece sinked to the bottom and my polys love to crawl all over/under/around it. I even have some irwinis that will some how wedge themselves in-between the driftwood and the bottom of the tank. I also have a floating piece with the marine land 3ft bamboo wrapped around it and I sometimes catch my moke up there lurking around in the leaves (it looks so natural and cool). My gar also likes to hang around the floating piece to.
