First off, I would like to say hello and introduce myself. My name's Terence, and I'm a 16 year old kid that lives in Baltimore. I first become intrigued in fish when my friend gave me his 7 gallon tank, along with his Angelfish in the beginning of December. As I took care of the fish, I added more life forms. I had added 2 neon tetras and one frog. Then a month later, I added a Betta fish, which I found out was a bad idea. I've been lurking around the forums and gathering information, and learned that my Betta fish killed my Angel due to lack of space. I flushed one of my tetras because it suffered from what looked like a "crooked" spine? My tetra couldn't swim straight and often looked dead, so I decided to flush him as I didn't want him to suffer anymore. 2 months later, a friend of my family gave me a 33g tank, and my mom a 26g tank, gravel, filters, and decorations included, all free of charge. Then I bought 3 Black Mollies as an addition to my lone neon tetra. As more time passes, I added 7 other neon tetras to my tank, along with 3 black neons and 3 algae-eating plecos. Couple of questions, the gender of those black mollies I purchased are 2 females and one male. One of the females has a bulge in the bottom of her chest, and now I'm suspecting that she's pregnant. And just recently, my male molly has been interacting with the other female molly, which is strange because during the 3 months that I had them, the male molly never interacted with her. Oh, and also, would it be a bad idea to mix the Betta fish (The Murderer) with the black mollies? I don't plan to ever, since I gave the Betta to my brother, but still the answer wouldn't hurt.