Bare Bottom vs substrate

[matix]

Hi there reefers,

I been a little confused about the idea of bare bottom vs substrate.

last week I removed all my substrate from the bottom of my tank because I was told that i could cause tank kill from bacteria building up in the substrate. And if I want to do substrate I would have to change a % of it every 3 months.

I now regret taking my sand out, it takes away the natural look. So my question is,

Is there a type of substrate that is safe and does not need to be changed ever.

Thanks