Some (if not all - not too sure) urchins eat Coraline, thus you may be waiting a long time for it to develop.
Do you have the lights for SPS? I would not suggest it as a beginner coral, difficult to keep particularly with summer heat coming. Personally I would add only one chromis now (as they can get territorial as they get bigger), and the hammer. The best of both worlds - just watch your water quality, which shouldn't be a problem as it is still a low bioload.
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