Lots of plants. Some to block out some light from the top/floaters or just loose stems on top.
They can take quite a while to warm up. I had one which was pretty sociable, but also too ended up very aggressive, then another timid and nice but still shy.
Are there any other aggressive fish in the tank?
New to FW fish? First tank in a long time or EVER??? Need some info on keeping fish?
Start here - Aquarium Advice Article
FW Favorites right now Clown Loaches, any shrimp - SW Vase Red Mangroves