It's a lepto, I saw the pictures in the other post you put in the general discussion forum and the top down shot where it appears to be brown you can see that it has a skeleton. The edges of leptos will flutter in the current as when they are open their flesh, much like a chalice, extends past the skeleton, though not the same extent as a chalice. The mouths are also not always as apparent on some of the more monochromatic variants, I use that loosely because as I said in my above post this is a VERY pretty green variation, unlike the jack-o-lantern variety where the mouths are screamingly obvious. The mouths on the ones I have are hardly discernable but, if you look closely you can find them. As for care requirements I mentioned a couple in my earlier post, it should be more than fine in mushroom coral light and flow conditions and the sweepers really aren't that long, at least on mine there not, about an inch or less. As they grow they'll encrust any rocks that they're on and will form a shelf if open space is next to its "growing path"
