I saw a youtuber who had a ten year old nano tank with just red Discosoma. It was actually pretty neat looking. They climbed all the way to the top of the tank. Maybe an all green one would be cool too if you want to keep them again. I thought Rhodactis weren't aggressive? I haven't decided where I want to place current or future things yet. Will different species of mushroom sting each other if they touch? I've read florida richordias sting and I'd like to add those in. Maybe I'll just let one side of the tank be a mushroom side so they don't sting the clove polyps and whatever else I put in.