Guppy Patern Change

[rockdon]

hey every one i have a guppy thats been changing colours and patterns. today i saw a new black stripe on one of my guppies i also noticed a yellow green spot at the begining of his tail i came back later and the stripe had become a spot and his tail was this yellowgreen colour and right behind his head had turned from wite to blue i came back later and every thing was the same as he usually was. he is still changing in that order to this minute.

all i want to know is if this is normal or if it means somthing or what.

btw the guppy is a male.

thanks!