I'm planning to put mangroves in the back of my new tank. I have had them in the old tank for a few years now. I have found the mangroves easier to keep happy than chateo and not as invasive as caulerpa. Plus, they just use the tank lighting and ambient light to grow as opposed to a separate fuge light. I think they look cool growing out of the back of the all in ones...but I'm sure not everyone would agree. If that appeals to you at all, let me know and we can go in on an order. I'm planning to go with bigger mangroves from the start (~20-inch)...last time I started with pods.
Think I may try the chaeto first, I already have a fuge light. Also trying to keep the focus on the tank instead of everything in the back.