Sometimes there are lucky ones I had one of mine that lived almost a year. He was the grandpa of them all. 😂 Also I have these spotted Rams horns that came on a plant they are really cool and I think you should check them out.
I've never kept Rams but my LFS has them in black substrate and it looks pretty cool. I agree though with @Andy's Fish Den choose whatever substrate you want they are pretty fish so the will go well with anything.