The most popular yellow colour enhancer vitamin for all kinds of yellow/golden fish. C.R. 8 # will increase yellow colour to all yellow fish, such as golden arrowana, golden gourami, golden oscars, golden discus, cichlids etc. Fish will eat and grow well. C.R.#8 can be used on breeder fish without any side effect. This product does not contain sex hormone and results can be achieved within 7 days.