HI THERE, I HAVE HAD MY FIRST TROPICAL TANK FOR ABOUT 6 WEEKS. I HAVE SEVERAL GUPPIES, SWORDTAIL'S AND PLATIES.MY PREGANANT ONES ARE ALL BLACK ON THIER GRAVIT SPOT. BUT ONE OF MY PLATY'S IS RED ON THE GRAVIT SPOT, LOOKING LIKE SHE'S HEAVILY PREGNANT WEIDTH AND BELOW HER TUMMY . SHE'S A VERY PALE...