Is it wrong to leave plants grow and grow and grow? Forgive me as it's been over 20 years since I've had a tank. I like real plants. When I did have a plant, I had a few tall thin plants (who knows what) that grew to the top of the water, then across to the other side of the tank. Must have been 2 feet in length if you were to straighten it end to end. I liked how some of the plants intertwined with others and well it looked natural in there (and cozy).