Okay so due to many problems with tail ripping, biting etc with Koi I moved him to a 1 gallon. He seems to like it, but it is to much work for me now that I have a job. I don't have time to do 2 changes on it a week. Unfortunatly I still have another 2 gallon, but am thinking I can handle 1. So anyways I just bought a 5g for him and I want to use live plants so I won't have to worry about his thin tail ripping. I want to spend as little money as possible on this. So I am wondering what plants if any will work with a largish rock substate. I would also like it if their is a type of plant that spreads and will fill up more of the tank over time. I would also like the plants to be low matenience as I have around 1 day a week to spend caring for tanks. Which is why I am moving up to all larger tanks. Any suggstions, care tips etc would be much appreciated.