yeah, the tile is for seaweed. i just sandwhich it, band it, drop it in, they attack the crap out of it lol. I put it in twice a week. I dont know if i would say natural look, but it holds the seaweed straight up and sort of blends in with the sand, so i guess you could say "natural" look lol. Also, yes, skimmerless still and ATS only yes. I think though, i will be adding carbon and some filtration because i'm getting tired of the free floating sand in the water and since i use Tap water for top offs, i figured carbon would be a nice addition.