we have had a few platy on our tank and all of a sudden 2 of them died leaving 1 remaining with a white scum fold over the eyes and body. When we removed the dead fish we noticed at least 25 baby platys! They are in a 10 gal tank that's been set up and stationary for at least 15 years with filtration and heating system and never had any diseas or fungus problems before. There is also white cotton like scum covering some of the fake plants. I'm concerned if we should treat the tank for ich, or a fungus, or bacteria. I'm also concerned with the fry and how to keep them safe as well! With having so many of them it makes it difficult to change the water or clean the tank because of how small they are. I will post some photos for a better understanding. Any advice or previous experiences would be greatly appreciated!!