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Oxygen depletion

Hi all,

I have been recently experimenting with DIY CO2 and the results are
certainly impressive. However, I am having real problems with oxygen
depletion overnight.  In the first week I killed my Farlowella and my Discus
are really breathing hard first thing in the morning.
I have an Aquaclear 200 that drips down into the tank and I thought that
that would provide enough aeration at night, but it doesn't appear to. I am
not using a reactor for the CO2, merely letting it bubble into the venturi
inlet on my Aquaclear 200 power head.

What does everyone do to counteract this? Should I turn on an airstone
overnight or something? I can't really turn off the CO2 since my water is
very soft and the pH swings are significant.


Rob Keniger

big bang solutions

<mailto:rob at bigbang_net.au>