Is it difficult? I mean from what ive read its just to keep a very high water quality, lots of room and quality food?
no, usually larger..there are some "mini" marbles that max out at 12-15" but getting one is another story..some people will tell you they are mini's until you grow them out and they turn out to be 24"..
You could find the answers to some if not all of your questions by just doing a little bit of research
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Have anyone ever heard of people hanging the roots ?
I have hanging pothos roots from the top of the tank and in the sump. They really suck up a ton of nitrate. With that and 5x recommended purigen, I keep my nitrates in check. I also have two submerged denitrate tubes in the sump with ultra low flow pumps.
Before with the heavy feeding requirements my nitrates would go from 10ppm after a water change up to 50ppm in 2 days. I was doing 3 60% WC per week. It was just too much. With 6 pothos on the sump and 4 large on the top of the tank (roots growing down into tank), plus the purigen, and the DIY denitrate tubes it takes about 10 days to hit 50ppm.
Incredible difference. I still do water changes every 4-5 days around 50% but it has made a huge difference. I strongly recommend large amounts of purigen and pothos. If the rays do mess with the hanging plant roots (mine don't) just move them to the sump and add a light.