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I'm going to go with chalice, but it may not have formed the peaks yet either.
True my space invader has just started to form spikes. It is about the diameter of a quarter and about 10 months old. Spiky pectinia are very slow growers. Not all pectinia spike. They are called plating pectinia. They very much like a regular chalice. But all ones i have seen have slight horizontal spike edges along new growth. More evident when not puffed out.
I get confused with the different types of pictinia. here is mine.