There is no need to make a Co2 reactor. You can buy a Hagen Co2 fermentation canister and bubble counter from http://www.liveaquaria.com. They're pretty inexpensive and will work on a 10. The fertilizer tabs are a good idea. What wattage is the light on the 10. I grow my plants under a 14 watt NO bulb. I have plants that don't really care about light. Banana plants will live a very short amount of time in an aquarium. If you do decide to get one be sure the bananas are above the substrate. As for the wall creeper get some Java moss.