hi all ive got two blue gouramis about 4 inch long, one of the blues is chasing the other blue around the tank for about a week now, it wont leave the other one alone when ever it sees the other one it chases it, ive just come in and noticed that the one doing the chasing has changed colour they have got very light stripes in them but this one the stripes have gone really dark blue and the tips of his tail and fins have gone a really bright sky blue is this normal or what 
