Clams often spawn from stress, like if the new water coming in is a different temp or salinity than the tank water. Not always a good thing. It's also a mess to clean up, make sure you've got good surface flow to keep O2 up, the skimmer is clean and running properly, and you've got spare water made up just in case you need it. For me, clams spawning is always a bad thing.
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Brad
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