Last night I turned off the pump, (and the computer) so I wouldn't have to hear it through my pillow, and now that I've turned it on in the morning the clicking is gone! It seems louder to me, but that could well be my imagination. In a few days I'm gonna take my system down for tinkering, when I get a couple new parts, and I'm gonna have to add taking apart the pump to my things to do, see If I can find any problems.
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