03-01-2009, 08:54 PM
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Both tanks that had fish loss are CO2 injected, however prior to the pressurized system I had a DIY system so CO2 is not new. but I was under the impression that pH change due to change in amount of dissolved CO2 wasn’t an issue.
"normal" pH in all my tanks is 8.0 to 8.2, my injected tanks run at 7.2
I cant find my nitrite test, I’m not to worried about it. my tanks are cycled and heavily planted.
I changed about 30-40% of the water, I don’t know exactly, I run the pressure and the siphon at the same time. the water moves at a rate of 1.5gpm. for about 10 minutes in my 37 gallon and 5 minutes in my 20 gallon. of course I matched the temp.
I don’t add dechlorinator, I have not for over a year. I checked a long time ago and checked again more recently. There are no chemicals including chlorine or chloramines added to my water.
I notice the abundance of bubbles on leaves and glass after a water change, I wonder if that has something to do with it. if bubbles got in their gills?