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Our New Discus Tank - VIa

by George J. Reclos

Corydoras aeneus (Gill 1858)

Breeding egg layers is something I have not succeeded in - not yet anyway. I will confess that I am not really anxious to do it (with the exception of Paratilapia polleni) but of course, I would do my best to ensure that those eggs would have a chance to hatch. Some days ago I was monitoring the pH of my discus tank (which has a KH = 2 therefore prone to large pH fluctuations if CO2 injection is not accurately controlled). The probe stayed in the water for 36 hours and I was about to remove it when I realized that my Corydoras aeneus had used it as a spawning site. 

Only of my friends, Tolis Ketselidis, suggested to use a razor to remove the eggs from the probe and use a floating nest to hatch them. I hesitated a lot since this particular probe is a laboratory one (and rather expensive) but I couldn't just dip the eggs in a saturated potassium chloride solution (the usual probe conditioner).

However, my Hemigrammus erythrozonus found the eggs and started to have lunch on them. After thinking for some more time (while trying to keep the H.erythrozonus away from the eggs), I decided to use the razor blade. I transferred all the eggs in the floating nest although at least half of them were destroyed by the blade. I don't know what will happen.. I just hope that next time the Corys will choose another place to place their eggs.  

Photos by MCH / G.Reclos

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