The Clam will probably appreciate the new light a lot so it only has to go if you want it to.
As for whether you can keep more...that is dependant on your tank dimensions. I would say there are quite a few people keeping LPS and some SPS with a 4 bulb T5HO. The SPS woul have to be right near the top though.
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Mark...
290g Peninsula Display, 425g total volume. Setup Jan 2013.
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