Your water parameters seem to be fine. At least not to the point that it would kill everything overnight. It almost sounds like you might have had a CO2 build up. Using a cannister doesn't agitate the surface so this might have been the cause.
Just trying to help narrow down the possibilities.
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250 gal display tank plumbed directly to my wallet
Last edited by Black Phantom; 03-18-2009 at 07:45 PM.
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