What Kind of media do you use in your sump?

[Coderad]

I don't think I will go with a sand bed, cause that would requier a light in the sump. I think I am leaning towards live rock, but I was at wai's the other day and he showed me this bag of stuff you put in a media bag, but that was like 110.00 for the bag of media. I am just trying to get my sump a mantinence free as possible my canister I have to clean once a week.