Gourami2012 said:
I bought 3 guppies yesterday (2 female 1 male). I noticed when i got back home yesterday that the one female had a white fin and was only swimming with the other healthy one. This morning i awoke to find her dead and now my other female has this white film across her fins and tail. Also none of my fish will eat. What's going on?
Looks that they are sick with fin rot... I found this in the Internet about fin rot:
"Not to hard to cure. Fish usually will live after treatments. Most common in the fancy varieties of goldfish, finrot can occur as a result of an injury, as a secondary infection once the fish has been weakened by another disease, or in some cases, as a primary infection (bacterial).
Finrot can be the result of a bacterial infection (which causes a more ragged rotting), or as a fungal infection (which rots the tail more evenly and is more likely to produce a white 'edge'). Sometimes, both types of infection are seen together. Infection is commonly brought on by bad water conditions, injury, poor diet, or outwintering fancy goldfish (who should live in warmer temperatures).
Finrot starts at the edge of the fins, and destroys more and more tissue until it reaches the fin base. If it does reach the fin base, the fish will never be able to regenerate the lost tissue. At this point, the disease may attack the fish's body directly."
You need to try to isolate them and try to treat them with both fungal and bacterial medicaments.
What other fish do you have in the tank? Is your tank fully cycled?
