thanks HeyPK, but i'm pretty sure a red plant on pix 1, 2, and 3 is not Myriophyllum tuberculatum. you can see pix here and compare with that pix. leaf shape is totally different. i'm trying to find scientific name. please help me out if you have information about that plant.HeyPK said:This one is Myriophyllum tuberculatum. I also saw a Potamogeton in one of your pictures. It is the one with wavy alternate leaves.