I took some water lettuce from my pond and placed them into my 150g. It looks really cool and provides lots of cover for my fish. Im suprised that my oscars and plecos have not torn them to pieces as they do with all my plastic plants. I was curious if anyone else has done this. I havnt seen any other tanks with floating plants in them is there a reason for this? I dont see how it would affect the water quality or health of my fish, so if im wrong then someone please correct me! Thanks!!!