02-01-2013, 12:22 PM
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Originally Posted by Athur
I recently did a nitrate test and it read .5 ppm.
doesnt look like its a N problem. Is your water very soft? This can cause swings in pH, which could cause some loss.
It is more likely that the stock that you bought was ill and just took time to die. I have had issue with wild stock cories never getting accustomed to the aquarium and slowly dying off. I would suggest watching the fish for rubbing, red gills, sunken bellies, fast breathing or any abnormal activity. Watch the fish for about 15 min a couple days in a row. Im not big on treating with chemicals for an unknow issue but if you see something let us know and we can suggest a chemical treatment.