today i lost about half my guppy population die today and the only symptoms are loss of colour and having huge white spots on there skin. i dont think its ich because the spots was not fuzzy
On second thought, you have way to many fish in that tank. You probably have high parameters and are getting fungal infections due to a decreased immune system from stressful water.
Oh ok. It still sounded like a fungal infection though.... Stress can cause it. How often do you change your water? Did any of your fry have any wounds? Sometimes a cut or scrape or bite can initiate a fungal infection.