I've built my sump a little high on the water line, so I don't think I will have enough space to use filter floss as a media. I've got about 3'-4" (will need to measure when I get home) of clearance above the water line. Seems I'm going to have to go with a filter sock, yeah? Filter socks are ok submerged as long as the top clears the water line from what I understand. Filter floss needs to clear the water line in order to be effective as I understand it. Is my thinking correct on this? Or can I have a partially submerged section of filter floss? I'm building my sump, so any suggestions or opinions are greatly appreciated.