Cory catfish breeding

1tdawg

AC Members
Apr 20, 2011
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I have 7 green cory's in a 20 gal long tank. They have been there for a little over 2 months. Dispute my attempts none of them have laid eggs. Could someone help me out with this? Advice would be very appreciated.
 
Cory's will breed if the temperature drops 6 degrees following a water change but the pH has to be relatively low, around 6-7 I believe?
 
I have a ph of about 7-8. As for the powerhead I'm working in getting a 100 gal filter ( hang on) for the tank. How can I lower the PH?
 
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