hello.one of my fish is a yellow gold colour,if you know what i mean.he is turning red.not his fins or tail,but from the bottom of his body upwards.would be very grateful if someone could tell me what this may be.thank you very much.xx

"gutted"? uh oh.
unfortunately, i have no idea what is wrong with your fish. however, you should check levels of chemicals in your tank- sometimes that leads to strange health problems and more often than not, death.
if you could get pictures of your little dude, that would help enormously- i dont know what is wrong with your fish because i dont know why or how this color change is happening. so, if you send in/attach a picture (more would be better) to this forum, i would be happy to look at it and give you a diagnosis and advice on treatment.