Thanks arapaimag!! I really appreciate your comments! I'm not very interested on having a "magazine-like" setup on my tank, but I just try to keep it as natural as possible! They told me that the plant I showed on the last pictures is a wild variation of Ceratophyllum demersum. I'm not very used to aquatic plants so I really don't know if that is really the ID of the plant I collected! Any help will be thanked!