Just wondering if anyone knows at what level do the various aquatic bladerworts and Aldrovanda float at? I have a small pond in my greenhouse that I used to overwinter some U. gibba and U. purpurea. The U. gibba has grown and floats on the top of the water. I thought the U. purpurea did not surrive because I did not see it. I was moving the surface plants around to check on the fish and I found the U. purpurea on the bottom. My U. vulgaris seems to like being a few inchs below the water. The reason I am asking is I have some U. inflata, Aldrovanda and U. radiata on the way I am currious to know how they will fit in.