I currently have a Marineland 10 gallon tank with one male swordtail. I recently purchased a Marina 20 gallon aquarium kit on Amazon, that I'll be getting in a couple of days. The new aquarium will have to go in the same spot as the 10 gallon because that's the only spot I have to put it. I would like to use the same gravel, bubbler and plastic plants that I have now. What is the best way to do this? I know I should have two females to go with my male, but I really want different types of fish that are colorful. I thought about maybe using the filter that I have now on my 10-gallon which will fit a 20 gallon. I bought it to replace the other the BioWheel that came with it. I really want to use the filter that comes with the new kit. I also read online that I could use both filters for a couple of weeks, but I don't think I will have room for two. Hope someone can help me out here. Thanks in advance.