Not an expert in this field but i believe everything plays a part. The more critical parameters are temp and quality of the crs. Low water temp will somehow intensify the colours. If you can provide these crs that mimics their natural environment they will look good. But mostly it depends on the quality. Some say that if you've got very good crs whose parentage are of very thick white, then these genes will be in the crs. and for these crs, even if the temperature is high, the white will not run. From personal experience, sometimes I did not perform water change for more than 2 months. The quality of my crs still looks the same. But after water change, their whiteness was further enhance. So everything plays apart.









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