Veiltail Fish

Question
Hi, I have these two fish that I just found out were Veiltail's they are really pretty.  I had 3 but one died about a month ago.  One of them a few days ago looked like he or she was going to die also, but, a few days later he/she was fine.  During those few days all the fish did was stay at the bottom back side of the tank.  It's stomach or bottom was very large I don't know if it was pregnant or what.  How can i tell the difference in male and female.  One is white color with small part of orange and the other is a light orange and dark orange sort of color

Answer
Goldfish sometimes get bloated from ingesting too much air if they eat from the surface.  Feed sinking pellets.  The only way to be sure of the sex of a goldfish is to observe them spawning.  FYI, goldfish need 20g minimum per fish even if they are small.  If you have them in too small a tank, you will have problems with toxins building up in your water causing your fish to become ill.