Silk plants too heavy?
I'm thinking about adding some plastic/silk plants to the tank. I like silk ones much better because they look more real, however I have a problem with them. While plastic plants stay in water in positions that resemple real aquatic plants, some of silk plants that I had before (especially bigger ones) leaned to the buttom of the tank as if they were too heavy. They were aquatic plants bought from drsFoster&Smith, so they were specifically designed for aquariums. Have anyone experienced the same thing and is there anything to do to fix that problem.
72g bowfront with Emperor 400:
Gouramis: 1 Opaline, 1 Gold, 1 Dwarf
Bolivian Ram, German Blue Ram, Kribensis
1 Black and 1 Lyretail Mollies, Swordtail
Purple Spotted Gudgeon, Pictus Cat
Gold Nugget Pleco, Rainbow Shark, Silver Dollar
6 Harlequin Rasboras, 6 Long-Finned Zebra Danios, 3 Cardinal Tetras
Plants: Banana plant