well this is my oahu terrain
i used your coral reef texture and it works fine,i also tried the sand but it came out pure black
also what size of bmp did you use to add the underwater cv to your one post?,a battleship or two would be awesome for this terrain but so far i havent come up with any good pics or the right size,ive tried all different sizes from 8x8-1024x1024 and they all come out way to big in the TE to look realistic.they end up looking the size of a couple of grids or more.