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Thank you for the welcome!  The tank has been set up for maybe 18 months. Do you really think that that modest number of fish could generate enough ammonia and nitrates, given that we do water changes regularly and feed them carefully?  Only the mollies are suffering, and only two of the eight...

Hey all!   I've had aquariums for about 20 years, but this is a new one to me.  One molly was gasping for air for a few weeks and died, and now two more are showing similar symptoms. I've had fish live for up to 11 years, and it's very rare for me to lose any, particularly such a hardy species...