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Old 10-11-2012, 10:37 PM   #6
HD Blazingwolf
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co2 is the killer

the silent killer is oxygen levels
i firmly believe this and this is why i happily run my wet/dry sump setup now. i inject what on my cannister would have been lethal, now only is slightly stressful if i make a mistake
its still possible to kill my fish with co2, but i have more room for error, and its VERY apparent. GOOD surface agitation and clean filters, plus good water chagne habits and happily growing plants will rpevent many of these problems
for reference, my dc is yellow 2 hours after co2 is on, not by the end of the light cycle. it stays that way all day, and when i get close to end of tank my working pressure increses 2-5 psi depending on ambient temperature and fish still are fine
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