I'm converting my 125 into my new turtle tank. I'm making a platform from plexi that will hang about 7" into the tank and be 2-3" deep. This will give the turtles plenty of swim room as well as some larger fish I may add to the tank. I'd like to get some type of substrate and plants for the platform to dress the tank up a little and make it more natural for the turtles. Any suggestion on low maintence plants