As far as having them above or below the water line, i prefer to have mine empty below the water line. Its quieter that way. If they empty out above the sump water line its louder, but you get good aeration of your water in the sump, so its a mixed bag. I dont know a whole lot about that type of filter sock but it looks like they are on the overflow lines loosely. That could allow waste to escape and muck up your bio media. If so, they should be secured tightly. If they are on tightly, then nevermind. Other than that I dont see any issues from that one pic, but if you could do a whole sump pic we could probably give more feedback if you like.