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The rockscape is up to you. Personally I've never been a fan of the "wall" look. I prefer having islands or a more minimalist look in the DT. I make up for adding a lot of rock in the sump to help with filtration.
Had a look through there some of them are brilliant other not so good. Just doesn't seem like there is a lot of hiding room for the fish in these island themes.
Yup. It all comes down to personal preference. I just like having less rock in my DT, and more in my sump. The "rock walls" really bug me for some reason. I had a few in the past, but now I just like having "space" in the DT.