WhAt ThE?!!?!?
 

ok all my guppies (male) died. i could see their fin color draining litterally!!!!!
i watch them asnd i see the color fading!!!!it scared the heck out of me. its like watching a scifi movie! in 5 minutes the color and the tail was gone!distintegrated/obliterated/noexistant! and then died?!!?!?wow my tank is really messed up!

What are your water parameters?

ok ph is 7.5+, ammonia is 0ppl and thats all i have right now....:/ i use a bio filter

You'll want to test nitrites and nitrates as well. Please post those when you get them, so we can help you further.
Also, what is the temp in the tank?

75 degrees farenheit

We still need to know nitrite and nitrate levels in the tank to be of much help...

There are a lot of possibilities here, and without enough information, there is no way for us to sort it out.