It does work quite well.nick a said:This is a sample of the food the breeder mentioned:http://www.cyclop-eeze.com/
It shows up in many sources:
The general consensus (rightly or wrongly) is that Astaxanthene and similar substances are red/yellow spectrum enhancers while blue/green is enhanced by spirulina.
Start with good quality fish, add a reasonable healthy diet and excellent tank maint. and you will have attractive fish.