dskidmore
Aquarium Advice Addict
I am not familiar with that particular variety of caulpera, but I think it should do ok just floating in the water. Plant it in the sand if that appeals to you. Many macroalgaes look better when planted in the sand.
It is very difficult to properly siphon sand without removing some of it. If you have lots of critters digging in your sand, let them take care of it. If you don't, then just before a water change, stir up a small portion of the sand to release the junk. The sand will settle faster than the junk, and you can siphon that out while it's still suspended in the water. Just don't do too large an area at once or you'll leave way too much icky stuff in the water.
It is very difficult to properly siphon sand without removing some of it. If you have lots of critters digging in your sand, let them take care of it. If you don't, then just before a water change, stir up a small portion of the sand to release the junk. The sand will settle faster than the junk, and you can siphon that out while it's still suspended in the water. Just don't do too large an area at once or you'll leave way too much icky stuff in the water.