Oh and if you hate the tannins as much as I do, remove the driftwood, and boil in a big pot of water for 2-4 hours. Then keep soaking in water in your sink (hopefully you have a two sided sink) - until the water stays clear and then put it back in the aquarium. Without serious measure you'll be fighting brown water for months. Totally harmless but not very attractive. Can you pick up a 5 or better yet a 10 gallon aquarium set that comes with a filter and thermometer? You can ask the fist store that sold you the angels what the issue back and maybe they'll let you bring two back or you're going to need yet a 3rd aquarium. It's unfortunate they didn't tell you (or didn't know) but before you purchase any fish you're not familiar with do a lot of research and find out it's needs beforehand. That's just terrible. I'm so glad I didn't take the three angelfish my friend offered to me - but then, they had them all together for years without problems they were just tired of caring for the tank. So while many may have fighting some may not.