03-10-2009, 04:44 PM
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You haven't provided us with the water data as onefish2fish asked, so it's not easy to answer your question. I agree with fishkid that you shouldn't be adding salt except for treatment or because the fish require brakish water, which black neons do not, and the salt may be a large part of the problem. Black neons are a species of characin, specifically Hyphessobrycon herbertaxelrodi, and they originate in the Rio Paraguay and Mato Grosso in Brazil, water that is very soft and never containing salt. Characins that live in rivers where there is a tidal influx of salt water always avoid such water, which is suggestive.
They are, like most characins, schooling fish and do better in small schools of at least six. As onefish2fish mentioned, your 10g tank is already beyond capacity so don't add more. A school of 10-12 black neons in their own 10g tank would be one option if you like this fish. Schooling fish are less stressed when they are in a group of their own kind either on their own or in a community setup that is large enough.