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here's my take on red....it's a genetic gift. they either have it or they don't. Red is easily promoted to overrun it's placement for show criteria by feeding color enhancing food. So not really a good idea to use shrimp meal or spirulina. The best to use if you must is carotene...
asagi's blue is best encouraged with 7.2-7.6 PH, and kh-gh no more than 125...80 or 90 is optimum but only with minimum stocking.
here again genetics play a part for blue coloration as color variations such as narumi is lightest followed by konjo/gunjo
keeping koi with special needs can be a challenge but it's all part of the learning curve. people who like hariwake, midori also have to work at getting the water right!
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