In this subject, i would also like to post a question. i have red/white ranchus that is kept in greenwater. After 2 months of living there, the white area under the belly (near anus) is turning into yellow. not orange, not red, but yellow. it happens to most of my ranchus that have white underbelly and living in greenwater.
I have another 1 red/white ranchu that happens to be kept in clear water, it doesnt have the yellow underbelly problem.

Anyone share this problem?