Hello! I have a tank filled with platies, tiger barbs and black-skirt tetras along with three plecos. My friend moved and had to get rid of his micky-mouse platy and gave it to me. She is the only of that type in the tank, the rest are all dark red/black and just under 2 inches(full-grown). However, over the last week or so, the yellow micky-mouse platy has nearly tripled her stomach size and there are small black strands visible in her stomach region. Is it possible that one of the red/black platies got her pregnant? I will try to get a picture, but she is hiding in a densely planted area, so thats challenging and I don't really want to yank her out. Any feedback is greatly appreciated! List your water parameters from your test kits - Ammonia, Nitrite, Nitrate, pH, Temperature, etc. Ammonia = almost 0.0 Tell how long your tank has been setup, brief history if you think it is important for your current problem. Tanks has been set up for 4 years List all tank mates: Platies, Black skirts, tiger barbs and plecos Detail your maintenance procedures - tank cleaning, filter changes, water changes, etc. How often do you do perform these tasks? What kind of foods are you feeding your fish or inverts? Tank cleaning, filter changes and water changes - every other weekend. I am feeding Marineland Tropical List tank size, equipment used and any other important details. 75 gallon heavily planted freshwater using marineland filtration system Do you know about the aquarium nitrogen cycle? If not, click that link and read that important article. If your tank is cycled, how did you cycle it? yes the tank was cycled for 3 months with cheap fish.