Lightening of corals is caused by not enough food and/or too much light....just the opposite of brown corals which indicate too much nutrient (NO3/PO4) and/or not enough light.
Corals may get lighter once in your tank and it may be just as healthy or even more healthy but you have to watch and make sure that they are still happy, growing and not going too far down the path to bleaching. Bascially if you like it pink rather than red and the brain seems to not be getting lighter and lighter and is happy ....no problem.
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