Yup, you can do sand. The downside is- It's kinda hard to clean, and if too much sand goes in your filters, they break. I've crashed three filters this way, so you've gotta be careful. When gravel vacuuming sand, just skim over to pick up all the debris.
I don't see the need for a pH buffer, most people really don't have terribly soft water, but... What cichlids do you plan on keeping?
I don't see the need for a pH buffer, most people really don't have terribly soft water, but... What cichlids do you plan on keeping?