I recently bought a bigger tank for my gold fish, and was left with a 10 gallon tank that was empty. I cleaned it out and added plants as well as new gravel. I purchased 2 sailfin mollys and within 2 days of being in the tank they began to just lay at the bottom of the tank motionless. One following the other and finally reaching a plant and sitting there for hours. Tonight one had very shallow breathing and almost no movement at all. All at once she started springing up to the top of the tank and floating back down without a twitch to the bottom. She did this multiple times before she finally stopped jumping and stopped breathing all together. My other is have labored breathing but he seems to he a bit better. I bought some different things, like an all range medication as well as a stabilizer to stabilize Ph, ammonia, and all that fun stuff. If someone could please give me some insight on what was wrong with them. Or what i need to do.