I have a 25 gallon freshwater fish tank. I woke up this morning turned on the light and went bathroom just like every morning. Then after I used the bathroom I can back and fed them like usual. Then I started watching them and one of my guppies at first was laying on the bottom not coming to get food. Then I noticed its like his scales are standing up or like decaying, and he is very bloated and also is missing some tail. Also there are white spots on his tail that look like little bubbles and around his gills there are also white blotches. What should I do??? Hard to get a picture because not swimming much .