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Wow guys first off thanks so much for the quick response... Well I tried brushing it off and it won't come off... And it is limited to the rock only...
When u got my live rock it was just the pink and purple from what incurs see buy I noticed this reddish colour really kick in since yesterday...
Is it ok if the red takes over the purple... Is it all the same just different colours?
Yup, all the same, just different colors. Sometimes though, the purple coraline can degrade if no light\bad water quality and start to turn paler into the pink/light red colors. If it's growing, you're fine.