Too high of a CO2 will deprive your fish of O2; do a water change fast! I've killed fish before by having mine up too high once. Susan On Dec 31, 2009, at 1:38 PM, Seattle_Aquarist wrote: > > Hi Shango, > > It may be a combination of the increase in CO2 and the water change. If you > increased the amount of CO2 going into the tank, that would have reduced the > amount of dissolved oxygen. The colder water we have in our water systems > during the winter will have lower dissolved gas (including oxygen) content. > When you removed the aquarium water and added the tap water that may have > reduced the oxygen as well. What you are seeing may be a combination of the > two. > > I agree that adding an airstone and increasing the water circulation, and > possibly dropping the CO2 back down, may be the best way to revive your > Ancistrous. > > Roy > > > _______________________________________________ > GSAS-Member mailing list > GSAS-Member@thekrib.com > http://lists.thekrib.com/mailman/listinfo/gsas-member _______________________________________________ GSAS-Member mailing list GSAS-Member@thekrib.com http://lists.thekrib.com/mailman/listinfo/gsas-member