I own four DP's, have had them for over a year and they are the last four of a starting six. I was completely ignorant when I bought these little guys and the guy at the LFS gave me a massive amount of wrong information. I will give my tank specs first then explain my situation: -I have a 20 gallon tank, my reads are zero across the board and around 5-10 for nitrates. -The tank is filled with decorations and a lot of fake plants/very few real ones. -I feed brine shrimp, snails and occasionally some blood worms. -I use Prime and stability during changes, which I do twice a week. One for 50% and one for 25%. The first guy died because my water was , he died in a month and it was from ignorance. The second guy died when we were asleep and was completely fine right before we went to bed after we fed them. He was a few months after the first. The rest have been fat and healthy for about a year, until a few weeks ago one of my babies (Precious) got sick and stopped eating. I treated the water and did a bunch of changes but found it was a full blood worm stuck in her.... I caught her in a net and pulled it out of her and she is as fat and as healthy as ever. But a few days later, so about a week ago now, one of my other DP's (Beautiful) stopped eating, became unsocial and started becoming very skinny. I treated the water again (I alternate between Metroplex and Prazipro usually) and as of yesterday, she has completely stopped being even remotely interested in food, completely pinched in tummy, swims with her head down and spirals... I know I am going to lose her because she won't eat, but I wanna know what this is and how to cure my other babies if they start to show signs. Few things to note that may help determine what it is: -One of my DP's (Little Guy) attacked the sick fish about a week ago over a snail, first time I have ever seen it, then did it again a few hours later when I tried to feed her again. She seemed fine so I chalked it up to territory issues and nature. -I have used more meds this month that any other month because of the first sick and thinking she has IP's. I only use Metroplex and Prazipro, and nothing else goes in my tank, other than Stability, prime and vitachem during changes. -Today I removed her from the tank into a container with half tank water and half fresh water to feed her warm peas soaked in garlic and I literally touched her face with it and she has ZERO interest. The poor little girl keeps trying to swim and you can tell is losing her drive to do so every hour. I doubt anyone can save her but any information or help would be very well appreciated. Symptoms one more time: Slight skin colour change - no appetite - spiral swimming and sometimes upside down swimming - sunken belly - sinks to bottom - and "head standing" when at the bottom sometimes if the current picks her up and moves her.