Here is a question in less then 1 week this frag changed significant color it start having a more greener look to it. It is not a new coral it is in the tank more then 3 months. It was always red with no green at all. What could be the reason? The only thing I changed during the last week was operating a 36W UV it is running for only 2 days I don't think it will effect the color this fast if it does at all.