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I'm looking for a plant that has a grass-like appearance; or at the very least grows somewhat thickly together and waves nicely when you put a current through it. There are a few other things, though, which are proving to be an issue to find. It has to be able to grow in a sandbed fairly easily, it can't ruthlessly attach to rock (so I can remove it from my rock), and it can't be harmful to soft corals (or at least not most of them).

I was thinking about maiden's hair, but I've found very inconclusive data about if it can be grown in sand or not. And would their flow requirements blow the sand around even if they could be planted in a sandbed?
 

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One algae that comes to mind is C.prolifera.
http://www.saltcorner.com/AquariumLibrary/browsespecies.php?CritterID=1988
It's one of the more stable caulerpa's,not as prone to go sexual.Grows in the sand quite well.Being one of the slower growing algaes you should be able to keep it from growing on the rocks by keeping it pruned back.

Other than that,actual seagrasses will fit the bill,but,they are not always that easy to find.

Maiden's hair,generally grows on rocks,and not in the sand.IME
 

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What you are describing does not really exist in the marine hobby. Caulerpa is invasive and the "prolifera" description should suggest something. It can be controlled to a point but even then it is a risk. If you don't mind giving up control, then caluerpa can work but you have to keep it trimmed. But it can stick to rocks.
http://reefbuilders.com/files/2011/09/IMG_3804-3.jpg
 
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