It does seem to be a smoking gun, doesn't it. There were two major things that just preceded the start of this goo, 1) I switched to ARM in the reactor (seems an unlikely cause since many people use ARM without problems) and 2) I started removing caulerpa, and some of it is quite disruptive into the sand bed.
Since dosing kalk with the topup, the pH has been down to 8.18 (which I hope is close enough to 8.2) at night, and 8.38 during the day (which I hope is close enough to 8.4). We'll see if this helps.
If anything, it doesn't seem to getting worse, not significantly anyways (KNOCK ON WOOD!!!!)
Thanks to everyone for their suggestions and words of encouragement!
__________________
-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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