I've ended up it a bit of a sticky situation... So I have two small fancy goldfish, Kirby and Peach, who have been living in 10 gallon tank. Last week I bought a 20 gallon (Yes, I know I'll need to upgrade again in a year or so, but I'm poor right now ) for them, and I was told it would probably cycle in a week or two with my old filter media from the current tank, which was set up before I knew what the nitrogen cycle was and has cycled with the fish in it over a few months. I planned on waiting as long as needed, but this was the same day my sister convinced my mom to buy a female betta, despite my protests that we didn't have anywhere to put it.:;smack ) We thought to put it in with the tropical tank, but when we got home my molly was laying on the bottom of the tank and shaking (The shaking has since subdued as we added aquarium salt, but she still lays on the tank bottom more than usual, some advice would be appreciated...) Seeing as this would not be an safe place to put a new fish, that left only the one gallon molly fry tank (ABSOLUTELY NOT ) and the goldfish. Again, despite my warning against it, the betta ended up with the goldfish, since we figured it would only be a short time before the goldfish were out, and it doesn't get very cold in our house (yay, 80 degree winters!) That brings us to today, when I noticed Peach, the larger of my goldies, with rips on her previously damage-free tail. I watched the three for a while as observed that Peach had no regards for the betta's personal space, pushing her around, but not attacking her. The betta would respond by lashing out but not pursuing the goldfish, making it clear that she just wanted them to stay away. This repeated multiple times before I decided I needed to figure out something quick. I wanted to move them straight to the 20G, but water tests showed that while nitrite and nitrate levels were zero, the ammonia was at .50 ppm. I could move the betta somewhere, but it would likely be a water pitcher with no filter, heating, or guaranteed safe water quality for an indefinite amount of time. Why must I do this to myself. Why. :'( So can anyone please help me? What should I do about this? My sister will never let me rehome the betta, and nobody else in the house cares at all about the health of any of my fish.