All of your parameters seem to be in check.
What are you feeding the sun coral?
My lfs usually carries a wide celection of zoanthids at good prices so I usually don't purchase zoanthids online. If your local stores do not stock any zoanthids then the other option is to purchase them over the internet and shipping could possibly get expensive. I'm not sure though as I've never shipped anything to PR before.
What kinds or color combinations are you looking for?
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